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BMW E9X Z4 E8X Coolant Expansion Tank
BMW E9X Z4 E8X Coolant Expansion Tank
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
Coolant Expansion Tank
Coolant Expansion Tank
2X Entries Into Our F80 M3 Sweepstakes
Rein - Corporate Logo
T#:592020
Part#: 17137640515
In Stock
$ 97.99 USD
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$ 97.99 USD
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Includes level sensor
Rein Coolant Expansion Tank - E46, E53, E83
Rein Coolant Expansion Tank - E46, E53, E83
2X Entries Into Our F80 M3 Sweepstakes
Rein - Corporate Logo
T#:402141
Part#: 17117573781
In Stock
$ 76.39 USD
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$ 76.39 USD
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Includes cap and level sensor
Coolant Expansion Tank
Coolant Expansion Tank
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Rein - Corporate Logo
T#:388723
Part#: 17137823626
In Stock
$ 78.99 USD
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$ 78.99 USD
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Mounts towards the front of the engine bay
BMW Coolant Expansion Tank - 17137642160
BMW Coolant Expansion Tank - 17137642160
2X Entries Into Our F80 M3 Sweepstakes
Rein - Corporate Logo
T#:45791749
Part#: 17137642160
In Stock
$ 85.00

This product was last offered at the strikethrough price on
04-28-2026

$ 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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Coolant Expansion Tank
Coolant Expansion Tank
2X Entries Into Our F80 M3 Sweepstakes
Rein - Corporate Logo
T#:591959
Part#: 17111741167
Ships in 2 Business Days
$ 69.99 USD
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$ 69.99 USD
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Plastic has a limited lifespan - replace every 80,000 miles
BMW E39 Coolant Expansion Tank
BMW E39 Coolant Expansion Tank
2X Entries Into Our F80 M3 Sweepstakes
Rein - Corporate Logo
T#:388645
Part#: 17111436381
In Stock at Vendor
$ 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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Coolant Expansion Tank
Coolant Expansion Tank
2X Entries Into Our F80 M3 Sweepstakes
Rein - Corporate Logo
T#:17704748
Part#: 17138677649
In Stock
$ 148.99

This product was last offered at the strikethrough price on
03-17-2026

$ 118.99 USD
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$ 118.99 USD
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OEM Rein Coolant Expansion Tank - F97 F98 G01 G02 B46 B58 S58
OEM Rein Coolant Expansion Tank - F97 F98 G01 G02 B46 B58 S58 ...
2X Entries Into Our F80 M3 Sweepstakes
Rein - Corporate Logo
T#:39059266
Part#: 17135A6A030
In Stock
$ 86.99

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

$ 75.99 USD
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$ 86.99

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

$ 75.99 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 - E60, E61, E63, E64
Rein Coolant Expansion Tank - E60, E61, E63, E64
2X Entries Into Our F80 M3 Sweepstakes
Rein - Corporate Logo
T#:402160
Part#: 17137542986
Ships in 2 Business Days
$ 82.99 USD
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$ 82.99 USD
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Includes fluid level sensor
Coolant Expansion Tank
Coolant Expansion Tank
2X Entries Into Our F80 M3 Sweepstakes
Rein - Corporate Logo
T#:591949
Part#: 17107514964
Ships in 4 Business Days
$ 80.99 USD
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$ 80.99 USD
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Includes bleeder screw
OEM Rein Coolant Expansion Tank Return Hose - E60 E63
OEM Rein Coolant Expansion Tank Return Hose - E60 E63
2X Entries Into Our F80 M3 Sweepstakes
Rein - Corporate Logo
T#:19545
Part#: 17127545653
Ships in 2 Business Days
$ 53.99

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

$ 52.99 USD
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$ 52.99 USD
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This is the coolant reservoir expansion tank return hose that connects to the bottom of the expansion tank. Over time, coolant hoses begin to get brittle and are susceptible to cracking and splitting. Replace your cracked or leaking coolant hose to prevent further leaks and potentially catastrophic failure. ​

This item fits the following BMWs:
2004-2010 E60 BMW 545i 550i
2004-2010 E63 BMW 645ci 650i
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Rein Coolant Expansion Tank - E70
Rein Coolant Expansion Tank - E70
2X Entries Into Our F80 M3 Sweepstakes
Rein - Corporate Logo
T#:592030
Part#: 17138621092
In Stock at Vendor
$ 100.99 USD
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$ 100.99 USD
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Replace your cracked or faded tank
Rein Coolant Expansion Tank - E70
Rein Coolant Expansion Tank - E70
2X Entries Into Our F80 M3 Sweepstakes
Rein - Corporate Logo
T#:592023
Part#: 17137647290
Ships in 4 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 740i
OEM Rein Coolant Expansion Tank Overflow Hose - BMW G30 530e, G12 740...
2X Entries Into Our F80 M3 Sweepstakes
Rein - Corporate Logo
T#:45757471
Part#: 17125A02485
Ships in 2 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.
BMW Coolant Expansion Tank - 17139485733
BMW Coolant Expansion Tank - 17139485733
2X Entries Into Our F80 M3 Sweepstakes
Rein - Corporate Logo
T#:45791753
Part#: 17139485733
In Stock at Vendor
$ 64.99

This product was last offered at the strikethrough price on
04-28-2026

$ 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 Coolant Expansion Tank - F97 F98 G01 G02 G05 G06 G07 - S58 B46 B58
Rein Coolant Expansion Tank - F97 F98 G01 G02 G05 G06 G07 - S58 B46 B...
2X Entries Into Our F80 M3 Sweepstakes
Rein - Corporate Logo
T#:55965843
Part#: 171386106612
Ships in 4 Business Days
New Item
$ 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 Coolant Expansion Tank Kit - F97 F98 G01 G02 G05 G06 G07 - S58 B46 B58
Rein Coolant Expansion Tank Kit - F97 F98 G01 G02 G05 G06 G07 - S58 B...
2X Entries Into Our F80 M3 Sweepstakes
Rein - Corporate Logo
T#:55965839
Part#: 17138610661
Ships in 4 Business Days
New Item
$ 56.99 USD
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$ 56.99 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 Coolant Expansion Tank - With Cap
Rein Coolant Expansion Tank - With Cap
2X Entries Into Our F80 M3 Sweepstakes
Rein - Corporate Logo
T#:53891623
Part#: 17135A6A030C
Ships in 4 Business Days
New Item
$ 99.99 USD
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$ 99.99 USD
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Replace your old brittle expansion tank
OEM Rein Coolant Expansion Tank Hose - BMW G01 G02 Gen1 B46
OEM Rein Coolant Expansion Tank Hose - BMW G01 G02 Gen1 B46
2X Entries Into Our F80 M3 Sweepstakes
Rein - Corporate Logo
T#:45757473
Part#: 17127535536
Back Ordered
$ 76.00

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

$ 73.99 USD
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$ 73.99 USD
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This hose connects the heat management module to the expansion tank's lower port. If your coolant expansion tank hose is cracked or leaking, replace it early to prevent further coolant loss and eventual overheating.
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Rein Coolant Expansion Tank - E65, E66
Rein Coolant Expansion Tank - E65, E66
2X Entries Into Our F80 M3 Sweepstakes
Rein - Corporate Logo
T#:593077
Part#: 17137647713
Ships in 4 Business Days
$ 99.99 USD
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$ 99.99 USD
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Replace your cracked or faded tank
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 USD
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$ 44.99 USD
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Coolant Expansion Tank
Coolant Expansion Tank
2X Entries Into Our F80 M3 Sweepstakes
Rein - Corporate Logo
T#:57086700
Part#: 17137642158
Ships in 4 Business Days
New Item
$ 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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Coolant Expansion Tank
Coolant Expansion Tank
2X Entries Into Our F80 M3 Sweepstakes
Rein - Corporate Logo
T#:592029
Part#: 17138616418
In Stock at Vendor
$ 85.99 USD
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$ 85.99 USD
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Replaced your cracked unit with a new coolant expansion tank
OEM Rein Coolant Expansion Tank Hose - Lower - BMW E65/66 7 Series
OEM Rein Coolant Expansion Tank Hose - Lower - BMW E65/66 7 Series ...
2X Entries Into Our F80 M3 Sweepstakes
Rein - Corporate Logo
T#:375750
Part#: 17127508015
Back Ordered
$ 29.99 USD
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Attaches from the bottom fitting on the expansion tank to the supply hose. Over time, coolant hoses begin to get brittle and are susceptible to cracking and splitting. Replace your cracked or leaking coolant hose to prevent further leaks and potentially catastrophic failure.
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OEM Rein Coolant Expansion Tank Overflow Hose - BMW G01 G02 Gen1 B46/58 B58
OEM Rein Coolant Expansion Tank Overflow Hose - BMW G01 G02 Gen1 B46/...
2X Entries Into Our F80 M3 Sweepstakes
Rein - Corporate Logo
T#:45757470
Part#: 17125A022D6
Ships in 2 Business Days
$ 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.
BMW Coolant Expansion Tank With Cap
BMW Coolant Expansion Tank With Cap
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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BMW Coolant Expansion Tank With Cap
BMW Coolant Expansion Tank With Cap
2X Entries Into Our F80 M3 Sweepstakes
Rein - Corporate Logo
T#:46616007
Part#: EPK0131
Ships in 4 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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OEM Rein Coolant Expansion Tank Overflow Hose - BMW F25 X3, F26 X4 N52 N20 N55
OEM Rein Coolant Expansion Tank Overflow Hose - BMW F25 X3, F26 X4 N5...
2X Entries Into Our F80 M3 Sweepstakes
Rein - Corporate Logo
T#:45757476
Part#: 17128651298
Ships in 4 Business Days
$ 31.99 USD
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$ 31.99 USD
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This hose connects the expansion tank to the upper radiator hose. If your coolant expansion tank hose is cracked or leaking, replace it early to prevent further coolant loss and eventual overheating.
Coolant Expansion Tank With Cap - 17111712835
Coolant Expansion Tank With Cap - 17111712835
2X Entries Into Our F80 M3 Sweepstakes
Rein - Corporate Logo
T#:46616014
Part#: EPK0012
Back Ordered
$ 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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OEM Rein Coolant Expansion Tank Hose - BMW G01 G02 Gen1 B46
OEM Rein Coolant Expansion Tank Hose - BMW G01 G02 Gen1 B46
2X Entries Into Our F80 M3 Sweepstakes
Rein - Corporate Logo
T#:45757474
Part#: 17127535528
Ships in 2 Business Days
$ 53.99

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

$ 51.99 USD
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$ 51.99 USD
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This hose connects the cylinder head to the expansion tank's upper port. If your coolant expansion tank hose is cracked or leaking, replace it early to prevent further coolant loss and eventual overheating.
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Coolant Hose from Expansion Tank - E36
Coolant Hose from Expansion Tank - E36
2X Entries Into Our F80 M3 Sweepstakes
Rein - Corporate Logo
T#:6964
Part#: 11531730351
Ships in 2 Business Days
$ 18.79 USD
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$ 18.79 USD
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This coolant hose connects the water hose part #11531738053 to the radiator coolant expansion tank.Fits E36 3 series with M50, S50 or S52 engine.

This item fits the following BMWs:
1992-1998 E36 BMW 325i 325is 325ic M3
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OEM Rein Lower Expansion Tank Coolant Hose - E83 X3
OEM Rein Lower Expansion Tank Coolant Hose - E83 X3
2X Entries Into Our F80 M3 Sweepstakes
Rein - Corporate Logo
T#:363441
Part#: 11533400205
Ships in 2 Business Days
$ 27.99 USD
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$ 27.99 USD
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Over time, coolant hoses begin to get brittle and are susceptible to cracking and splitting. Replace your cracked or leaking coolant hose to prevent further leaks and potentially catastrophic failure.
Rein Engine Coolant Hose - Upper Radiator To Expansion Tank - BMW G3X 5, 6, 7 ser.
Rein Engine Coolant Hose - Upper Radiator To Expansion Tank - BMW G3X...
2X Entries Into Our F80 M3 Sweepstakes
Rein - Corporate Logo
T#:52903294
Part#: 17129844478
Back Ordered
New Item
$ 49.99 USD
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$ 49.99 USD
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Upgrade your cooling system with the Rein Automotive replacement coolant hose, engineered to meet or exceed the rigorous standards of your BMW.
OEM Rein Cylinder Head To Expansion Tank Coolant Hose - E53 X5 N62 4.4L 4.8L
OEM Rein Cylinder Head To Expansion Tank Coolant Hose - E53 X5 N62 4....
2X Entries Into Our F80 M3 Sweepstakes
Rein - Corporate Logo
T#:379756
Part#: 17127509967
Ships in 4 Business Days
$ 38.99 USD
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$ 38.99 USD
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Replace your cracked or leaking radiator hose to prevent further leaks and potentially catastrophic failure.

Fits the following BMWs:
2003+ E53 BMW X5 N62 4.4L 4.8L

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OEM Rein Heater Core, Expansion Tank, Throttle Body Coolant Hose - E36
OEM Rein Heater Core, Expansion Tank, Throttle Body Coolant Hose - E3...
2X Entries Into Our F80 M3 Sweepstakes
Rein - Corporate Logo
T#:6965
Part#: 11531738053
In Stock
$ 44.99 USD
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This is the large "T" shaped heater hose that connects the engine with the radiator expansion tank, heater core and throttle body. Fits E36 3 series with M50 or S50 engine.

This item fits the following BMWs:
1992-1999 E36 BMW 325i 325is 325ic M3
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Rein Expansion Tank Hose - E12, E21, E23, E24, E28, E30, E32, E34
Rein Expansion Tank Hose - E12, E21, E23, E24, E28, E30, E32, E34 ...
2X Entries Into Our F80 M3 Sweepstakes
Rein - Corporate Logo
T#:19431
Part#: 17121712736
In Stock
$ 13.99 USD
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$ 13.99 USD
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VENT HOSE 17121712736 Manufactured by CRP

OEM Rein Expansion Tank Return Hose - E36 323is/ic, 328i/is, M3
OEM Rein Expansion Tank Return Hose - E36 323is/ic, 328i/is, M3 ...
2X Entries Into Our F80 M3 Sweepstakes
Rein - Corporate Logo
T#:14593
Part#: 11531740649
In Stock
$ 30.99

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

$ 18.99 USD
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$ 18.99 USD
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This is the radiator expansion tank return hose for the cooling system on E36 models with the M52 or S52 engine. This hose goes from the expansion tank to the main coolant return pipe.

This item fits the following BMWs:
1996-1998 E36 BMW 323is 323ic 328i 328is 328ic M3
1996-1998 Z3 BMW Z3 2.8
1998-2000 Z3 BMW M Roadster M Coupe
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OEM Rein Expansion Tank Vent Hose - E82/8 E9X N52
OEM Rein Expansion Tank Vent Hose - E82/8 E9X N52
2X Entries Into Our F80 M3 Sweepstakes
Rein - Corporate Logo
T#:402113
Part#: 17127618510
In Stock
$ 32.99 USD
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$ 32.99 USD
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Acts as a vent hose between the upper radiator hose and the expansion tank. Runs the length of the top of the radiator.
Rein Expansion Tank Hose - E39
Rein Expansion Tank Hose - E39
2X Entries Into Our F80 M3 Sweepstakes
Rein - Corporate Logo
T#:375748
Part#: 11531438633
In Stock
$ 18.99 USD
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$ 18.99 USD
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Runs from the expansion tank to auxiliary water pump
Rein Expansion Tank Hose - E31, E38, E39
Rein Expansion Tank Hose - E31, E38, E39
2X Entries Into Our F80 M3 Sweepstakes
Rein - Corporate Logo
T#:375756
Part#: 11531741404
In Stock
$ 8.45 USD
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$ 8.45 USD
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Connects the expansion tank to the radiator
Expansion Tank Hose
Expansion Tank Hose
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Rein - Corporate Logo
T#:375751
Part#: 17111723521
Ships in 2 Business Days
$ 16.99 USD
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$ 16.99 USD
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Connects the expansion tank to the radiator
Expansion Tank Hose
Expansion Tank Hose
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Rein - Corporate Logo
T#:375747
Part#: 11531438632
Ships in 2 Business Days
$ 24.99 USD
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$ 24.99 USD
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Expansion Tank Vent Pipe
Expansion Tank Vent Pipe
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Rein - Corporate Logo
T#:402415
Part#: 17127521775
In Stock at Vendor
$ 28.99 USD
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$ 28.99 USD
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Replace your cracked and leaking hose with this replacement from Rein
Expansion Tank Vent Hose
Expansion Tank Vent Hose
2X Entries Into Our F80 M3 Sweepstakes
Rein - Corporate Logo
T#:591986
Part#: 17127519247
Ships in 4 Business Days
$ 29.99 USD
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$ 29.99 USD
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With quick connect coupling
Water Hose - Water Pump To Expansion Tank
Water Hose - Water Pump To Expansion Tank
2X Entries Into Our F80 M3 Sweepstakes
Rein - Corporate Logo
T#:594311
Part#: 17127575453
Ships in 4 Business Days
$ 67.99

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

$ 38.99 USD
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Replacement water hose from Rein
OEM Rein Expansion Tank Hose - F07 F10 F12 F13 N63 4.4L
OEM Rein Expansion Tank Hose - F07 F10 F12 F13 N63 4.4L
2X Entries Into Our F80 M3 Sweepstakes
Rein - Corporate Logo
T#:554679
Part#: 17127592645
Ships in 4 Business Days
$ 29.99 USD
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Replace your cracked or leaking radiator hose to prevent further leaks and potentially catastrophic failure.

Fits the following BMW Chassis:
F07, F10, F12, F13,

Fits the following engines:
N63 4.4L

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OEM Rein Expansion Tank Hose - E53 X5 N62
OEM Rein Expansion Tank Hose - E53 X5 N62
2X Entries Into Our F80 M3 Sweepstakes
Rein - Corporate Logo
T#:379752
Part#: 17127509965
Ships in 4 Business Days
$ 34.99 USD
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$ 34.99 USD
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This is one of the hoses exiting from the bottom of the expansion tank on your BMW. Over time, coolant hoses begin to get brittle and are susceptible to cracking and splitting. Replace your cracked or leaking coolant hose to prevent further leaks and potentially catastrophic failure.
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Expansion Tank Vent Hose
Expansion Tank Vent Hose
2X Entries Into Our F80 M3 Sweepstakes
Rein - Corporate Logo
T#:592006
Part#: 17127541146
In Stock at Vendor
$ 36.99 USD
Free Shipping on orders $49 and up
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$ 36.99 USD
Free Shipping on orders $49 and up
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Replace your leaking hose
OEM Rein Expansion Tank Hose - E53 X5 M62 4.4L 4.6L
OEM Rein Expansion Tank Hose - E53 X5 M62 4.4L 4.6L
2X Entries Into Our F80 M3 Sweepstakes
Rein - Corporate Logo
T#:363439
Part#: 11537505950
Ships in 2 Business Days
$ 27.99 USD
Free Shipping on orders $49 and up
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$ 27.99 USD
Free Shipping on orders $49 and up
Add to Wish List

Replace your cracked or leaking radiator hose to prevent further leaks and potentially catastrophic failure.

This item fits the following BMWs: 
2000-2003 E53 BMW X5 4.4i 4.6is

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