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Rein Coolant Expansion Tank - 17137640514 - E9x, E8x, E84
Rein Coolant Expansion Tank - 17137640514 - E9x, E8x, E84
2X Entries Into Our F80 M3 Sweepstakes
Rein - Corporate Logo
T#:402142
Part#: 17137640514
In Stock
$ 70.99

This product was last offered at the strikethrough price on
06-22-2026

$ 70.35 USD
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$ 70.35 USD
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Includes level sensor
Rein N55 Coolant Expansion Tank - 17137640515 - E9x, E8x
Rein N55 Coolant Expansion Tank - 17137640515 - E9x, E8x
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Rein - Corporate Logo
T#:592020
Part#: 17137640515
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$ 97.99 USD
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$ 97.99 USD
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Includes level sensor
Rein Coolant Expansion Tank - 17117573781 - E46, E83 X3, E53 X5
Rein Coolant Expansion Tank - 17117573781 - E46, E83 X3, E53 X5 ...
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T#:402141
Part#: 17117573781
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$ 76.39 USD
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$ 76.39 USD
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Includes cap and level sensor
Rein Coolant Expansion Tank - 17137823626 - I12 i8
Rein Coolant Expansion Tank - 17137823626 - I12 i8
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Rein - Corporate Logo
T#:388723
Part#: 17137823626
In Stock
$ 78.99

This product was last offered at the strikethrough price on
10-15-2026

$ 47.59 USD
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Mounts towards the front of the engine bay
Rein N47 N55 Coolant Expansion Tank - 17137642160 - F3x, F22, F23, F87
Rein N47 N55 Coolant Expansion Tank - 17137642160 - F3x, F22, F23, F8...
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T#:45791749
Part#: 17137642160
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$ 79.99 USD
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Expansion tanks take constant abuse from high heat and harsh coolant, making them prone to cracking or failure over time. A damaged tank can quickly lead to overheating and serious engine damage, so replacement is critical at the first sign of trouble. Features: Direct fitment for hassle-free installation Precision-molded to OE specs for perfect sensor and hose connections Durable construction stands up to extreme heat and coolant chemicals Factory pressure-tested for reliable performance
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Rein Coolant Expansion Tank - 17111741167 - E39 540i, E38 740i 740iL 750iL, E31
Rein Coolant Expansion Tank - 17111741167 - E39 540i, E38 740i 740iL ...
2X Entries Into Our F80 M3 Sweepstakes
Rein - Corporate Logo
T#:591959
Part#: 17111741167
Ships in 1 Business Day
$ 69.99

This product was last offered at the strikethrough price on
10-22-2026

$ 54.59 USD
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$ 54.59 USD
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Plastic has a limited lifespan - replace every 80,000 miles
Rein M52 M54 Coolant Expansion Tank - 17111436381 - E39 525i 528i 530i
Rein M52 M54 Coolant Expansion Tank - 17111436381 - E39 525i 528i 530...
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T#:388645
Part#: 17111436381
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$ 87.99 USD
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$ 87.99 USD
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BMW E39 Coolant Expansion Tank is an essential component designed to maintain the proper coolant level in your vehicle's cooling system. Manufactured with high-quality materials, this expansion tank ensures reliable performance and durability, preventing engine overheating by accommodating the expansion of coolant as it heats up. The kit includes a level sensor and cap, providing everything needed for a seamless installation. This expansion tank is specifically engineered to meet the exact specifications of your BMW E39, offering a perfect fit and optimal functionality.

  • Complete Kit: Includes level sensor and cap for easy installation.
  • High-Quality Construction: Built with durable materials for long-lasting performance.
  • Prevents Overheating: Helps manage coolant expansion, ensuring engine protection.
  • Exact Fit: Designed to meet the precise specifications of your BMW E39.
  • Enhanced Reliability: Ensures proper coolant level maintenance for optimal cooling system function.
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Rein Engine Coolant Expansion Tank - 17138677649 - F3x, F22, F23
Rein Engine Coolant Expansion Tank - 17138677649 - F3x, F22, F23 ...
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Rein - Corporate Logo
T#:17704748
Part#: 17138677649
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$ 118.99 USD
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$ 118.99 USD
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Rein Coolant Expansion Tank - 17135A6A030 - G01, F97, G02, F98
Rein Coolant Expansion Tank - 17135A6A030 - G01, F97, G02, F98 ...
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T#:39059266
Part#: 17135A6A030
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$ 86.99 USD
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$ 86.99 USD
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Coolant expansion tanks can crack over time, especially during services where they need to be removed. Replace your tank with a brand new tank to ensure your cooling system remains leak-free.
Rein Coolant Expansion Tank - 17107514964 - E53 X5
Rein Coolant Expansion Tank - 17107514964 - E53 X5
2X Entries Into Our F80 M3 Sweepstakes
Rein - Corporate Logo
T#:591949
Part#: 17107514964
Back Ordered
$ 80.99

This product was last offered at the strikethrough price on
10-22-2026

$ 58.95 USD
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$ 58.95 USD
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Includes bleeder screw
Rein Coolant Expansion Tank - 17137542986 - E60, E61, E63 E64 6 Series
Rein Coolant Expansion Tank - 17137542986 - E60, E61, E63 E64 6 Serie...
2X Entries Into Our F80 M3 Sweepstakes
Rein - Corporate Logo
T#:402160
Part#: 17137542986
Ships in 1 Business Day
$ 82.99

This product was last offered at the strikethrough price on
10-22-2026

$ 66.09 USD
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$ 66.09 USD
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Includes fluid level sensor
Rein Coolant Expansion Tank - 17138621092 - E70, F15, E71, F16, F86
Rein Coolant Expansion Tank - 17138621092 - E70, F15, E71, F16, F86 ...
2X Entries Into Our F80 M3 Sweepstakes
Rein - Corporate Logo
T#:592030
Part#: 17138621092
In Stock at Vendor
$ 100.99

This product was last offered at the strikethrough price on
10-22-2026

$ 68.39 USD
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$ 68.39 USD
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Replace your cracked or faded tank
Rein M57 Coolant Expansion Tank - 17138570079 - E90 335d
Rein M57 Coolant Expansion Tank - 17138570079 - E90 335d
2X Entries Into Our F80 M3 Sweepstakes
Rein - Corporate Logo
T#:555023
Part#: 17138570079
Ships in 3 Business Days
$ 124.99

This product was last offered at the strikethrough price on
10-22-2026

$ 82.99 USD
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$ 82.99 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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Engine Coolant Expansion Tank Cap
Engine Coolant Expansion Tank Cap
2X Entries Into Our F80 M3 Sweepstakes
Rein - Corporate Logo
T#:59038367
Part#: 17135A1BD89
Ships in 3 Business Days
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$ 9.99 USD
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$ 9.99 USD
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Rein Coolant Expansion Tank - With Cap - 17135A6A030C - G01, F97, G02, F98
Rein Coolant Expansion Tank - With Cap - 17135A6A030C - G01, F97, G02...
2X Entries Into Our F80 M3 Sweepstakes
Rein - Corporate Logo
T#:53891623
Part#: 17135A6A030C
Ships in 3 Business Days
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$ 99.99 USD
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$ 99.99 USD
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Replace your old brittle expansion tank
Coolant Expansion Tank
Coolant Expansion Tank
2X Entries Into Our F80 M3 Sweepstakes
Rein - Corporate Logo
T#:57086700
Part#: 17137642158
Ships in 3 Business Days
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$ 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 F3X N20 2.0L
Rein Coolant Expansion Tank With Cap And Level Sensor - BMW F22/23 F3...
2X Entries Into Our F80 M3 Sweepstakes
Rein - Corporate Logo
T#:58782356
Part#: 17137642158K
Ships in 3 Business Days
New Item
$ 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
Rein B48 B58 Coolant Expansion Tank - 17139485733 - G30 5 Series, G32 6 Series, G11 7 Series, G14 G15 G16 8 Series
Rein B48 B58 Coolant Expansion Tank - 17139485733 - G30 5 Series, G32...
2X Entries Into Our F80 M3 Sweepstakes
Rein - Corporate Logo
T#:45791753
Part#: 17139485733
Back Ordered
$ 54.99

This product was last offered at the strikethrough price on
05-15-2026

$ 52.99 USD
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$ 52.99 USD
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Expansion tanks take constant abuse from high heat and harsh coolant, making them prone to cracking or failure over time. A damaged tank can quickly lead to overheating and serious engine damage, so replacement is critical at the first sign of trouble. Features: Direct fitment for hassle-free installation Precision-molded to OE specs for perfect sensor and hose connections Durable construction stands up to extreme heat and coolant chemicals Factory pressure-tested for reliable performance
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Rein B48 Coolant Expansion Tank Overflow Hose - 17125A02485 - G30 530e, G11 740e xDrive
Rein B48 Coolant Expansion Tank Overflow Hose - 17125A02485 - G30 530...
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T#:45757471
Part#: 17125A02485
Ships in 3 Business Days
$ 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.
Rein Coolant Expansion Tank - 17137647290 - E70, E71 X6 50iX X6 ActiveHybrid X6 M
Rein Coolant Expansion Tank - 17137647290 - E70, E71 X6 50iX X6 Activ...
2X Entries Into Our F80 M3 Sweepstakes
Rein - Corporate Logo
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
Coolant Expansion Tank W/ Cap
Coolant Expansion Tank W/ Cap
2X Entries Into Our F80 M3 Sweepstakes
Rein - Corporate Logo
T#:592210
Part#: 17137529273
In Stock at Vendor
$ 44.99

This product was last offered at the strikethrough price on
10-22-2026

$ 42.99 USD
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$ 42.99 USD
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Rein Coolant Expansion Tank - 171386106612 - G01, F97, G02, F98, G05, G06, G07
Rein Coolant Expansion Tank - 171386106612 - G01, F97, G02, F98, G05,...
2X Entries Into Our F80 M3 Sweepstakes
Rein - Corporate Logo
T#:55965843
Part#: 171386106612
Ships in 3 Business Days
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$ 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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Rein N62 N73 Coolant Expansion Tank - 17137647713 - E65 7 Series, E66 745Li 750Li 760Li
Rein N62 N73 Coolant Expansion Tank - 17137647713 - E65 7 Series, E66...
2X Entries Into Our F80 M3 Sweepstakes
Rein - Corporate Logo
T#:593077
Part#: 17137647713
Ships in 3 Business Days
$ 99.99 USD
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$ 99.99 USD
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Rein Coolant Expansion Tank for the E65 and E66 on N62 and N73 engines, an OE-equivalent replacement for cracked or faded tanks. Look for cracking, broken nipples, or damaged mounting points, which let coolant escape from the cooling system. Replacing the tank keeps the coolant where it belongs as fluid expands and contracts with temperature changes.
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Rein B46 B58 Coolant Expansion Tank Overflow Hose - 17125A022D6 - G01 X3 M40i X3 sDrive30i X3 xDrive30i, G02 X4 M40i X4 xDrive30i
Rein B46 B58 Coolant Expansion Tank Overflow Hose - 17125A022D6 - G01...
2X Entries Into Our F80 M3 Sweepstakes
Rein - Corporate Logo
T#:45757470
Part#: 17125A022D6
Ships on Nov 19, 2026
$ 35.99 USD
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$ 35.99 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.
Rein N55 Coolant Expansion Tank With Cap - E8x/E9x N55 - EPK0131 - E9x, E8x
Rein N55 Coolant Expansion Tank With Cap - E8x/E9x N55 - EPK0131 - E9...
2X Entries Into Our F80 M3 Sweepstakes
Rein - Corporate Logo
T#:46616007
Part#: EPK0131
Ships in 3 Business Days
$ 104.99 USD
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$ 104.99 USD
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The coolant expansion tank provides a place for excess coolant to flow as temperatures rise and fall. Because it constantly endures extreme temperature changes, it’s prone to cracking or breaking over time. Keeping coolant contained within the system is essential, so if your tank shows signs of damage—such as cracks, broken nipples, or compromised mounting points—it’s time for a replacement.
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Rein Coolant Expansion Tank With Cap - EPK0012 - E30 318i 318is, E36 318i 318is 318ti, E34 525i
Rein Coolant Expansion Tank With Cap - EPK0012 - E30 318i 318is, E36 ...
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Rein - Corporate Logo
T#:46616014
Part#: EPK0012
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$ 29.99 USD
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$ 29.99 USD
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The coolant expansion tank provides a place for excess fluid as coolant expands and contracts with temperature changes. Constant exposure to these extremes can cause the tank to crack, break, or suffer damage to its nipples or mounting points. To keep your cooling system sealed and functioning properly, any damaged tank should be replaced.
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Rein Coolant Expansion Tank With Cap - EPK0013 - E39 540i, E38 740i 740iL 750iL, E31 840Ci 850Ci 850CSi
Rein Coolant Expansion Tank With Cap - EPK0013 - E39 540i, E38 740i 7...
2X Entries Into Our F80 M3 Sweepstakes
Rein - Corporate Logo
T#:46616009
Part#: EPK0013
In Stock at Vendor
$ 71.99 USD
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$ 71.99 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. You want to keep all the coolant in your vehicle in the cooling system. If your tank has experienced damage such as cracking, nipples breaking off, or mounting point damage, you will need to replace it. This replacement will fit perfectly and provide the same heating and cooling characteristics as an original unit. When replacing, be sure to have some extra coolant. Check ECS Tuning's website for a wide variety of coolants specifically designed for your car. Most German vehicles require specialized coolant. Be sure to pick up the proper coolant when refilling to avoid damage or premature corrosion.
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Rein N63 Engine Coolant Reservoir - EPT0274 - G30 5 Series, G11 7 Series, G14 G15 G16 8 Series
Rein N63 Engine Coolant Reservoir - EPT0274 - G30 5 Series, G11 7 Ser...
2X Entries Into Our F80 M3 Sweepstakes
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T#:52516268
Part#: EPT0274
Ships in 3 Business Days
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$ 114.99 USD
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$ 114.99 USD
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Protect your BMW investment with the Rein EPT0274 Engine Coolant Reservoir, the professional’s choice for cooling system restoration.

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