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BMW Thermostats

BMW thermostats are known to fail, but luckily they typically fail wide open - meaning that your car can still cool. We offer thermostats from various OE suppliers we trust along with upgraded motorsport specific thermostats where applicable to make sure your BMW stays cool on track.
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Rein Thermostat Assembly - F Chassis, G-Chassis - B48
Rein Thermostat Assembly - F Chassis, G-Chassis - B48
2X Entries Into Our F80 M3 Sweepstakes
Rein - Corporate Logo
T#:53891628
Part#: 11537644811
Ships in 3 Business Days
New Item
Sale - Save 15% $ 322.99

This product was last offered at the strikethrough price on
06-10-2026

$ 274.43 USD
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Sale - Save 15%
$ 322.99

This product was last offered at the strikethrough price on
06-10-2026

$ 274.43 USD
Add to Wish List
Whether you're managing a fleet of "spirited" daily drivers or prepping a chassis for the circuit, the Rein CTA0079 offers the peace of mind that comes with OE-quality engineering.
Rein Thermostat Assembly - F22 F87 F23 F30 F34 F32 F33 F36 F15 F16 - N55
Rein Thermostat Assembly - F22 F87 F23 F30 F34 F32 F33 F36 F15 F16 - ...
2X Entries Into Our F80 M3 Sweepstakes
Rein - Corporate Logo
T#:55965849
Part#: 11537598865
Ships in 3 Business Days
New Item
Sale - Save 5% $ 79.99

This product was last offered at the strikethrough price on
08-31-2026

$ 75.99 USD
Add to Wish List
Sale - Save 5%
$ 79.99

This product was last offered at the strikethrough price on
08-31-2026

$ 75.99 USD
Add to Wish List
A malfunctioning or lazy thermostat can lead to poor fuel trim efficiency, sluggish performance, and destructive overheating. This Rein thermostat assembly is engineered as a robust direct replacement for your worn factory unit, ensuring proper coolant regulation through the radiator under heavy loads.
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Engine Coolant Thermostat - F25 F26 - N55
Engine Coolant Thermostat - F25 F26 - N55
2X Entries Into Our F80 M3 Sweepstakes
Rein - Corporate Logo
T#:55965845
Part#: 11537586784
Ships in 3 Business Days
New Item
Sale - Save 5% $ 85.99

This product was last offered at the strikethrough price on
08-31-2026

$ 81.69 USD
Free Shipping on orders $49 and up
Add to Wish List
Sale - Save 5%
$ 85.99

This product was last offered at the strikethrough price on
08-31-2026

$ 81.69 USD
Free Shipping on orders $49 and up
Add to Wish List
Maintain exact control over your N55’s operating temperatures under demanding street and track conditions with this Rein replacement thermostat unit. Engineered to match factory standards, this complete housing and thermostat assembly ensures your cooling system handles thermal loads flawlessly to prevent heat soak or dangerous overheating.
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Gasket, Water Pump (Cooling System)
Gasket, Water Pump (Cooling System)
2X Entries Into Our F80 M3 Sweepstakes
Elring - Corporate Logo
T#:54852013
Part#: B47.470
Ships in 7 Business Days
New Item
$ 11.99 USD
Free Shipping on orders $49 and up
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$ 11.99 USD
Free Shipping on orders $49 and up
Add to Wish List
Upgrade your worn components with this high-quality piece and drive with the confidence that your engine is sealed tight and performing at its absolute best.

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