BMW Coolant Expansion Tanks

BMW Expansion Tank With Cap - 17138570079

2X Entries Into Our F80 M3 Sweepstakes

T#:46616019

Part#: EPK0146

Ships in 3 Business Days

$ 93.99 USD

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The coolant expansion tank serves as a reservoir for excess coolant as it expands and contracts with changing temperatures. Since it’s constantly exposed to extreme heat cycles, it can eventually crack, split, or suffer broken nipples or mounting points. To keep your cooling system sealed and operating properly, any damaged tank should be replaced.

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Rein Expansion Tank Cap - E30, E34

2X Entries Into Our F80 M3 Sweepstakes

T#:592018

Part#: 17137639023

Ships in 3 Business Days

$ 14.99 USD

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$ 14.99 USD

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1.4 Bar pressure

Coolant Expansion Tank W/ Cap

2X Entries Into Our F80 M3 Sweepstakes

T#:592210

Part#: 17137529273

In Stock at Vendor

$ 44.99 USD

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$ 44.99 USD

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Expansion Tank With Cap

2X Entries Into Our F80 M3 Sweepstakes

T#:46616025

Part#: EPK0138

Ships in 3 Business Days

$ 71.99 USD

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$ 71.99 USD

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The coolant expansion tank allows excess coolant to flow in and out as temperatures rise and fall. Over time, repeated exposure to extreme temperature changes can cause the tank to crack, split, or break. To keep your cooling system sealed and functioning properly, any tank showing signs of damage—such as cracks, broken nipples, or compromised mounting points—should be replaced.

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Coolant Expansion Tank

2X Entries Into Our F80 M3 Sweepstakes

T#:593078

Part#: 17138616418

Ships in 1 Business Day

$ 63.99 USD

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$ 63.99 USD

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The coolant expansion tank in your vehicle gives additional fluid a place to go after expansion and contraction from temperature change. Because it is subjected to such drastic changes on a regular basis, it can often crack or break.

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Rein Coolant Expansion Tank - E70

2X Entries Into Our F80 M3 Sweepstakes

T#:592023

Part#: 17137647290

Ships in 3 Business Days

$ 85.99 USD

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$ 85.99 USD

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Plastic expansion tanks have a limited lifespan - replace every 80,000 miles

OEM Rein Coolant Expansion Tank Overflow Hose - BMW G30 530e, G12 740...

2X Entries Into Our F80 M3 Sweepstakes

T#:45757471

Part#: 17125A02485

In Stock

$ 41.99 USD

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$ 41.99 USD

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This hose connects the expansion tank to the radiator. If your coolant expansion tank hose is cracked or leaking, replace it early to prevent further coolant loss and eventual overheating.

Coolant Expansion Tank

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T#:16242201

Part#: 17137590626

Ships in 1 Business Day

$ 123.99

This product was last offered at the strikethrough price on
05-08-2026

$ 120.99 USD

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$ 120.99 USD

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Rein Coolant Expansion Tank - F97 F98 G01 G02 G05 G06 G07 - S58 B46 B...

2X Entries Into Our F80 M3 Sweepstakes

T#:55965843

Part#: 171386106612

Ships in 3 Business Days

$ 49.99 USD

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$ 49.99 USD

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Keep your ultimate driving machine cool under pressure with this replacement auxiliary expansion tank from Rein. On modern turbocharged BMWs, the secondary cooling system plays a critical role in managing intake charge air temperatures, making a solid reservoir vital for both spirited street driving and track day reliability.

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Expansion Tank Mounting Clamp

2X Entries Into Our F80 M3 Sweepstakes

T#:591954

Part#: 17111707777

Ships in 1 Business Day

$ 6.99 USD

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$ 6.99 USD

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Locks the expansion tank into the mounting plate via the large hole in the bottom of the tank

Expansion Tank Mounting Plate

2X Entries Into Our F80 M3 Sweepstakes

T#:593026

Part#: 17101439110

Ships in 1 Business Day

$ 68.99 USD

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$ 68.99 USD

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These plastic supports mount to the side of the radiator, and are used to hold the expansion tank in place.

URO Radiator Mounting Plate for Expansion Tank - Z4

2X Entries Into Our F80 M3 Sweepstakes

T#:639486

Part#: 17112248408

Ships in 1 Business Day

$ 69.99 USD

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$ 69.99 USD

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URO Parts is one of the leading manufacturers of high quality direct replacement aftermarket components, covering a wide range of makes and models. All of their replacement parts are manufactured to ISO 9000 certification standards, so you can expect long lasting performance from URO Parts. As a leading source of high performance BMW parts and accessories since 1993, we at Turner Motorsport are honored to be the go-to supplier for tens of thousands of enthusiasts the world over. With over two decades of parts, service, and racing experience under our belt, we provide only quality performance and replacement parts. All of our performance parts are those we would (and do!) install and run on our own cars, as well as replacement parts that are Genuine BMW or from OEM manufacturers. We only offer parts we know you can trust to perform! URO Mounting Plate - This item fits the following BMW Chassis: E85,E86 Fits BMW Engines including: M54,N52

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OEM Mahle-Behr Coolant Expansion Tank Cap - E30 325e/i 1988-91, E34 5...

T#:369633

Part#: 17111742232

Ships in 1 Business Day

$ 18.99 USD

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$ 18.99 USD

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This radiator expansion tank cap fits E30 325e 325es 325i 325is 325ix 325ic with M20 engine from 1988 . It is a common failure item. When this item fails, it cannot hold pressure which results in your BMW overheating. If you are overhauling your coolant system, now is the time to consider preventative replacing this cap. It is also referred to as the coolant reservoir cap.

This item fits the following BMWs:
1988-1991 E30 BMW 325e 325es 325i 325ic 325is 325ix
1989-1990 E34 BMW 525i with M20 engine

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BMW Bracket

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T#:17339421

Part#: 17111438819

Ships in 1 Business Day

$ 67.99

This product was last offered at the strikethrough price on
05-07-2026

$ 65.99 USD

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$ 65.99 USD

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This plastic piece ensures proper mounting of the radiator.

URO Expansion Tank Mounting Plate - BMW E83 X3

2X Entries Into Our F80 M3 Sweepstakes

T#:639534

Part#: 17113400018

Ships in 1 Business Day

$ 90.99 USD

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Secures the expansion tank to the radiator

Engine Coolant Expansion Tank Cap

2X Entries Into Our F80 M3 Sweepstakes

T#:59038367

Part#: 17135A1BD89

Ships in 3 Business Days

$ 9.99 USD

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$ 9.99 USD

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Coolant Expansion Tank

2X Entries Into Our F80 M3 Sweepstakes

T#:57086700

Part#: 17137642158

Ships in 3 Business Days

$ 55.99 USD

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$ 55.99 USD

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The factory expansion tank is one of the most common failure points in modern BMW cooling systems, often failing along seam welds or developing micro-cracks around fluid quick-connect fittings. Replacing a degraded reservoir with this direct-fit Rein expansion tank restores pressure containment, ensures accurate coolant expansion volume, and prevents fluid loss before it turns into severe engine damage.

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Rein Coolant Expansion Tank With Cap And Level Sensor - BMW F22/23 F3...

2X Entries Into Our F80 M3 Sweepstakes

T#:58782356

Part#: 17137642158K

Ships in 3 Business Days

$ 76.99 USD

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$ 76.99 USD

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Eliminate coolant leaks with this brand new reservoir and cap kit from Rein - integrate coolant level sensor included with the coolant reservoir

Genuine MINI Coolant Expansion Tank

T#:393093

Part#: 17137823626

Ships in 1-2 days

7% off MSRP $ 129.99

MSRP stands for Manufacturer's Suggested Retail Price. This is the suggested retail price provided by the manufacturer, supplier or seller.

$ 120.99 USD

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7% off MSRP

$ 129.99

MSRP stands for Manufacturer's Suggested Retail Price. This is the suggested retail price provided by the manufacturer, supplier or seller.

$ 120.99 USD

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Genuine BMW Coolant Expansion Tank - High Temp Circuit - BMW G42 G20 ...

T#:613870

Part#: 17138610652

Ships in 1-2 days

6% off MSRP $ 198.99

MSRP stands for Manufacturer's Suggested Retail Price. This is the suggested retail price provided by the manufacturer, supplier or seller.

$ 187.99 USD

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6% off MSRP

$ 198.99

MSRP stands for Manufacturer's Suggested Retail Price. This is the suggested retail price provided by the manufacturer, supplier or seller.

$ 187.99 USD

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If your coolant reservoir tank has cracked or if one of the mounting points has broken, this is the perfect replacement to ensure your coolant system remains leak-free. This reservoir specifically works with the high-temp circuit, which is responsible for cooling your engine block and cylinder head.

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Genuine BMW - Level 1 Expansion Tank Replacement Kit - E36, Z3 ...

T#:374427

Part#: 17111723520KT2

Ships in 1-2 days

$ 400.99

This product was last offered at the strikethrough price on
08-13-2026

$ 395.99 USD

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$ 395.99 USD

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Genuine BMW Coolant Expansion Tank - Low Temp Circuit - BMW G42 G20 G...

T#:613871

Part#: 17138610653

Ships in 1-2 days

6% off MSRP $ 170.99

MSRP stands for Manufacturer's Suggested Retail Price. This is the suggested retail price provided by the manufacturer, supplier or seller.

$ 160.99 USD

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6% off MSRP

$ 170.99

MSRP stands for Manufacturer's Suggested Retail Price. This is the suggested retail price provided by the manufacturer, supplier or seller.

$ 160.99 USD

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If your coolant reservoir tank has cracked or if one of the mounting points has broken, this is the perfect replacement to ensure your coolant system remains leak-free. This reservoir specifically works with the low-temp circuit, which is responsible for cooling your manifold-integrated intercooler

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Genuine BMW Expansion Tank - F97 F98 G01 G02 B46 B58 S58

T#:31655876

Part#: 17135A6A030

Ships in 1-2 days

6% off MSRP $ 189.99

MSRP stands for Manufacturer's Suggested Retail Price. This is the suggested retail price provided by the manufacturer, supplier or seller.

$ 178.99 USD

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6% off MSRP

$ 189.99

MSRP stands for Manufacturer's Suggested Retail Price. This is the suggested retail price provided by the manufacturer, supplier or seller.

$ 178.99 USD

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Genuine BMW Expansion Tank - F97 F98 G01 G02 B46 B58 S58 is an essential component designed to regulate coolant levels and pressure in the engine's cooling system. Over time, exposure to high temperatures and constant expansion and contraction can cause plastic tanks to become brittle, leading to cracks and leaks. A failing expansion tank can result in coolant loss, overheating, and reduced engine performance. This genuine BMW replacement ensures a precise fit, optimal cooling efficiency, and long-lasting durability for BMW F97, F98, G01, and G02 models equipped with B46, B58, and S58 engines.

Regulates coolant levels and pressure for efficient engine cooling
Prevents coolant leaks and potential overheating issues
OE BMW part ensures perfect fit and compatibility
High-quality construction resists wear from thermal cycling
Direct replacement for BMW F97, F98, G01, and G02 models with B46, B58, and S58 engines
Designed for long-term durability and reliable performance

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Genuine BMW - Level 1 Expansion Tank Replacement Kit - E46 M52,M54 ...

T#:380426

Part#: 17117573781OEKT1

Ships in 1-2 days

$ 589.99

This product was last offered at the strikethrough price on
07-10-2026

$ 499.99 USD

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$ 499.99 USD

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Genuine BMW - Expansion Tank Replacement Kit - E39 540i

T#:374589

Part#: 17111741167KT4

Ships in 1-2 days

$ 388.99

This product was last offered at the strikethrough price on
06-23-2026

$ 384.99 USD

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$ 384.99 USD

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Replace your expansion tank with all Genuine BMW parts for guaranteed reliability and longevity.

The kit includes:

Genuine BMW expansion tank with level sensor
Genuine BMW expansion tank cap and seal
Genuine BMW bleeder screw
Genuine BMW hose clamps
Genuine BMW coolant level sensor
When doing any sort of repair or maintenance there is no replacement for genuine factory parts. Turner Motorsport carries the Genuine BMW brand with pride and has the parts you need to complete your next project with confidence.

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Genuine BMW Expansion Tank - 17137604431 - i01 i3

T#:191374

Part#: 17137604431

Ships in 3 Business Days

6% off MSRP $ 162.99

MSRP stands for Manufacturer's Suggested Retail Price. This is the suggested retail price provided by the manufacturer, supplier or seller.

$ 152.99 USD

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6% off MSRP

$ 162.99

MSRP stands for Manufacturer's Suggested Retail Price. This is the suggested retail price provided by the manufacturer, supplier or seller.

$ 152.99 USD

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Genuine BMW Expansion Tank -

When doing any sort of repair or maintenance there is no replacement for genuine factory parts. Turner Motorsport carries the Genuine BMW brand with pride and has the parts you need to complete your next project with confidence.

This item fits the following BMW Chassis:
i01 i3

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Expansion Tank - E70, E71

T#:46468

Part#: 17137589526

Ships in 3 Business Days

6% off MSRP $ 202.99

MSRP stands for Manufacturer's Suggested Retail Price. This is the suggested retail price provided by the manufacturer, supplier or seller.

$ 190.99 USD

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6% off MSRP

$ 202.99

MSRP stands for Manufacturer's Suggested Retail Price. This is the suggested retail price provided by the manufacturer, supplier or seller.

$ 190.99 USD

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Genuine BMW Expansion Tank
This item fits the following BMW Chassis:
E70 X5M,E71 X6M,E70 X5,E71 X6

Fits BMW Engines including:
S63

Meyle Coolant Expansion Tank - BMW G0X X3 X4, F9X X3M X4M

5X Entries Into Our F80 M3 Sweepstakes

T#:50066859

Part#: 17135A6A030

In Stock

$ 75.99

This product was last offered at the strikethrough price on
09-20-2026

$ 65.99 USD

Limited Qty Sale

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$ 75.99

This product was last offered at the strikethrough price on
09-20-2026

$ 65.99 USD

Limited Qty Sale

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Replaces cracked or aged coolant expansion tank.

Genuine BMW Coolant Expansion Tank - Low Temp Circuit - BMW G20 G22/2...

T#:49857448

Part#: 17135A270D3

Ships in 3 Business Days

6% off MSRP $ 170.99

MSRP stands for Manufacturer's Suggested Retail Price. This is the suggested retail price provided by the manufacturer, supplier or seller.

$ 160.99 USD

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6% off MSRP

$ 170.99

MSRP stands for Manufacturer's Suggested Retail Price. This is the suggested retail price provided by the manufacturer, supplier or seller.

$ 160.99 USD

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If your coolant reservoir tank has cracked or if one of the mounting points has broken, this is the perfect replacement to ensure your coolant system remains leak-free. This reservoir specifically works with the low-temp circuit, which is responsible for cooling your manifold-integrated intercooler

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Expansion Tank - E24

T#:45000

Part#: 16131153314

Ships in 6 Business Days

3% off MSRP $ 109.99

MSRP stands for Manufacturer's Suggested Retail Price. This is the suggested retail price provided by the manufacturer, supplier or seller.

$ 106.99 USD

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3% off MSRP

$ 109.99

MSRP stands for Manufacturer's Suggested Retail Price. This is the suggested retail price provided by the manufacturer, supplier or seller.

$ 106.99 USD

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Genuine BMW EXPANSION TANK
Fits BMW Engines including:
M30,S38

Expansion Tank - E31

T#:63355

Part#: 34331160304

Ships in 6 Business Days

3% off MSRP $ 211.99

MSRP stands for Manufacturer's Suggested Retail Price. This is the suggested retail price provided by the manufacturer, supplier or seller.

$ 204.99 USD

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3% off MSRP

$ 211.99

MSRP stands for Manufacturer's Suggested Retail Price. This is the suggested retail price provided by the manufacturer, supplier or seller.

$ 204.99 USD

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Genuine BMW Expansion Tank - Ate

Expansion Tank - E21

T#:44522

Part#: 16121118911

Ships in 6 Business Days

3% off MSRP $ 93.99

MSRP stands for Manufacturer's Suggested Retail Price. This is the suggested retail price provided by the manufacturer, supplier or seller.

$ 90.99 USD

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3% off MSRP

$ 93.99

MSRP stands for Manufacturer's Suggested Retail Price. This is the suggested retail price provided by the manufacturer, supplier or seller.

$ 90.99 USD

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Genuine BMW EXPANSION TANK

Fits BMW Engines including:
M10

MTC Charge Air Cooler Expansion Tank - BMW F22/23 F3X B48/B46 B58 ...

T#:27405534

Part#: 17138617045

Ships in 9 Business Days

$ 64.46 USD

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$ 64.46 USD

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Your charge air cooler's coolant expansion tank acts as a reservoir, housing extra coolant, and gives fluid a place to go after expansion and contraction from temperature change. Because the plastic tank is subjected to regular temperature changes, the plastic can become brittle over time and will often crack or break. If your tank is leaking and you lose too much coolant, your charge air cooler will not function properly and your air intake temperatures will begin to rise, reducing horsepower and efficiency. If your tank has experienced damage such as cracking, nipples breaking off, or mounting point damage, you will need to replace it.

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Expansion Tank Cap

T#:371228

Part#: 17111742232

Ships in 9 Business Days

$ 6.99 USD

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$ 6.99 USD

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1.4 Bar pressure. Older radiator caps being to lose their ability to hold pressure over time. Resulting in a lower boiling point for the coolant system.

Coolant Expansion Tank - E65 745i/li, 750i/li, 760i/li

T#:186486

Part#: 17137647713

Ships on Oct 26, 2026

$ 81.99 USD

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$ 81.99 USD

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This high quality BEHR brand expansion tank is used on E65/E66 7 series with the N62 and N73 engines, and is a common failure item. BEHR was the original equipment supplier to BMW, so you know the BEHR made expansion tank will be the highest quality available. Be cautious of competitors selling this part for less -- is it a BEHR? Probably not. We only carry the BEHR brand expansion tank as it is the only one we use in our own BMWs.

If you are overhauling your coolant system, now is the time to consider preventative replacing this expansion tank. These are known to go bad, causing a leak which can leave you stranded. We have found that the expansion tanks should be replaced based on age as well as condition. Expansion tanks seem to have a lifespan of less than six years before they show signs of fatigue and wear. Pre-emptively replacing the expansion tank as part of an overall maintenance plan can prevent you from getting stranded from a sudden failure later on. Replaces part numbers 17137543003 and 17138600275.

This item fits the following BMWs:
2002-2008 E65 BMW 745i 745li 750i 750li 760i 760li

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Coolant Expansion Tank

10X Entries Into Our F80 M3 Sweepstakes

T#:45723154

Part#: 17137642158

In Stock

Sale - Save 25% $ 67.99

This product was last offered at the strikethrough price on
05-03-2026

$ 50.99 USD

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Sale - Save 25%

$ 67.99

This product was last offered at the strikethrough price on
05-03-2026

$ 50.99 USD

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Coolant Expansion Tank - With Cap

10X Entries Into Our F80 M3 Sweepstakes

T#:55497428

Part#: 17137640514

Ships on Nov 6, 2026

Sale - Save 10% $ 69.99

This product was last offered at the strikethrough price on
10-08-2026

$ 62.99 USD

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Qty

Sale - Save 10%

$ 69.99

This product was last offered at the strikethrough price on
10-08-2026

$ 62.99 USD

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Coolant Expansion Tank

10X Entries Into Our F80 M3 Sweepstakes

T#:53044121

Part#: 17137601948

In Stock

Sale - Save 8% $ 72.99

This product was last offered at the strikethrough price on
05-03-2026

$ 67.49 USD

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Qty

Sale - Save 8%

$ 72.99

This product was last offered at the strikethrough price on
05-03-2026

$ 67.49 USD

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Febi Coolant Expansion Tank - E31, E38, E39

We Price Match - Give Us A Call or Chat!

T#:381841

Part#: 17111741167

Special Order: No Guaranteed ETA

$ 90.99 USD

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$ 90.99 USD

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Replace your cracked or faded expansion tank.

Expansion Tank Cap

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T#:382437

Part#: 17117639021

Special Order: No Guaranteed ETA

$ 25.99 USD

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$ 25.99 USD

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Maintain maximum cooling efficiency and system pressure with this Febi Bilstein 2.0 bar replacement cap.

BMW Coolant Expansion Tank

We Price Match - Give Us A Call or Chat!

T#:38553896

Part#: 17137575578

Special Order: No Guaranteed ETA

$ 73.99 USD

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$ 73.99 USD

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Coolant Expansion Tank Keep your vehicle's cooling system functioning properly with the Coolant Expansion Tank, designed to safely contain and manage coolant expansion as engine temperatures rise. This durable tank helps regulate pressure and fluid levels, preventing overheating and protecting your engine components from damage. Key Features: OEM-Quality Construction – Built to meet or exceed factory standards for perfect fit and reliability. Long-Lasting Durability – Crafted from high-quality materials resistant to cracking, corrosion, and extreme heat. Pressure Regulation – Ensures balanced pressure and fluid levels for effective cooling system operation. Leak-Free Design – Seals securely to prevent coolant leaks and maintain optimal engine temperature. Simple Installation – Direct-fit replacement for a quick and easy upgrade. Replace your damaged or aging Coolant Expansion Tank to maintain optimal cooling performance and protect your engine from heat-related issues.

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MINI F5X F6X Expansion Tank

10X Entries Into Our F80 M3 Sweepstakes

T#:28138156

Part#: 17137617362

Special Order: No Guaranteed ETA

Sale - Save 5% $ 81.99

This product was last offered at the strikethrough price on
05-03-2026

$ 77.51 USD

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Qty

Sale - Save 5%

$ 81.99

This product was last offered at the strikethrough price on
05-03-2026

$ 77.51 USD

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MINI F5X F6X Expansion Tank

For Mini owners looking to maintain optimal engine performance, the MINI F5X F6X Expansion Tank is an essential component. This expansion tank ensures proper cooling system functionality, preventing overheating and potential engine damage. Crafted with high-quality materials, it guarantees durability and reliability for long-term use, providing peace of mind to Mini enthusiasts.

Ensures proper cooling system functionality
Prevents overheating and potential engine damage
Crafted with high-quality materials for durability
Provides peace of mind to Mini enthusiasts

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Febi Coolant Expansion Tank - E90 335d

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T#:38553903

Part#: 17134714830

Special Order: No Guaranteed ETA

$ 96.99 USD

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$ 96.99 USD

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Replace your damaged expansion tank to prevent coolant loss or potential overheating issues.

This item fits the following BMW Chassis:
E90

Fits BMW Engines including:
M57

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BMW Coolant Expansion Bottle

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T#:16907163

Part#: 17137619189

Special Order: No Guaranteed ETA

$ 83.99 USD

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$ 83.99 USD

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Coolant Expansion Tank Cap

T#:56001934

Part#: 46221

Special Order: No Guaranteed ETA

$ 19.99 USD

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$ 19.99 USD

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This Febi Bilstein coolant expansion tank cap is designed to maintain the exact 1.4 bar pressure required to maximize your coolant's boiling point.

Coolant Expansion Tank

T#:56544005

Part#: 17139846642

Special Order: No Guaranteed ETA

$ 83.99 USD

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$ 83.99 USD

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Protect your modern BMW from catastrophic thermal overload with the Febi Bilstein coolant expansion tank.

Coolant Expansion Tank

T#:56544003

Part#: 17138677649

Special Order: No Guaranteed ETA

$ 82.99 USD

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$ 82.99 USD

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Prevent catastrophic track-day or daily-driving overheating with this OEM-spec replacement Coolant Expansion Tank by Febi Bilstein.

Coolant Expansion Tank

T#:56507814

Part#: 17137642160

Special Order: No Guaranteed ETA

$ 62.99 USD

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$ 62.99 USD

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This Febi Bilstein coolant expansion tank offers OEM quality, engineered to withstand aggressive driving, high thermal loads, and pressurized environments.