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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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Mosselman S55 Billet Oil Thermostat - Silver - BMW F8X S55 3.0L
Mosselman S55 Billet Oil Thermostat - Silver - BMW F8X S55 3.0L ...
Mosselman Turbosystems - Corporate Logo
T#:4621129
Part#: OTS55.T85
In Stock
$ 459.00 USD
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$ 459.00 USD
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**** DOES NOT INCLUDE HARDWARE ****** The S55 engine is no stranger to oil cooling problems, that’s why we recommend installing the MSL Oil Thermostat. The standard oil thermostat will reach around 120 degrees Celsius with a normal driving style. The MSL Oil Thermostat will open at a lower temperature than the standard oil thermostat (at 85 degrees Celsius) and will keep the temperature stable between 95 and 105 degrees Celsius. Installing the MSL thermostat ensures a cooler oil temperature which will result in more stable performance, but above all this improves the reliability of the engine. It is recommended to install the thermostat, especially for cars that are tuned. The Thermostat is plug-and-play and made out of a solid block of high-grade aluminum at our own facility. It is equipped with a real thermostat, not an always open solution. The oil will still reach the operating temperature at the same time as a stock thermostat Features Include: 20°C/68F Lower Than Stock Rock Solid Housing - CNC machined housing. Real Thermostat - Equipped with a real thermostat, not an always open solution. For use in hot and cold climates Quick Installation - Takes only 30 minutes to install.
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N55 Mosselman Billet Oil Thermostat
N55 Mosselman Billet Oil Thermostat
Mosselman Turbosystems - Corporate Logo
T#:4621130
Part#: OTN55.T85
In Stock
$ 399.99 USD
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$ 399.99 USD
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**** DOES NOT INCLUDE HARDWARE ****** Hardware - ES4772301 The N55 engine is no stranger to oil cooling problems, that�s why we recommend installing the MSL Oil Thermostat. The standard oil thermostat will reach around 120 degrees Celsius with a normal driving style. The MSL Oil Thermostat will open at a lower temperature than the standard oil thermostat (at 85 degrees Celsius) and will keep the temperature stable between 95 and 105 degrees Celsius. Installing the MSL thermostat ensures a cooler oil temperature which will result in more stable performance, but above all this improves the reliability of the engine. It is recommended to install the thermostat, especially for cars that are tuned. The Thermostat is plug-and-play and made out of a solid block of high-grade aluminum at our own facility. It is equipped with a real thermostat, not an always open solution. The oil will still reach the operating temperature at the same time as a stock thermostat Features Include: 20�C/68F Lower Than Stock Rock Solid Housing - CNC machined housing. Real Thermostat - Equipped with a real thermostat, not an always open solution. For use in hot and cold climates Quick Installation - Takes only 30 minutes to install.
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N54 & E8x/E9x N55 Mosselman Billet Oil Thermostat
N54 & E8x/E9x N55 Mosselman Billet Oil Thermostat
For Gasket/Install kit see T#4799665
Mosselman Turbosystems - Corporate Logo
T#:4621131
Part#: OTN54.T85
In Stock
$ 379.99 USD
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$ 379.99 USD
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The N54 engine is no stranger to oil cooling problems, that’s why we recommend installing the MSL Oil Thermostat. The standard oil thermostat will reach around 120 degrees Celsius with a normal driving style. The MSL Oil Thermostat will open at a lower temperature than the standard oil thermostat (at 85 degrees Celsius) and will keep the temperature stable between 95 and 105 degrees Celsius. Installing the MSL thermostat ensures a cooler oil temperature which will result in more stable performance, but above all this improves the reliability of the engine. It is recommended to install the thermostat, especially for cars that are tuned.
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Mosselman Billet Oil Thermostat With Installation Kit
Mosselman Billet Oil Thermostat With Installation Kit
Mosselman Turbosystems - Corporate Logo
T#:27338734
Part#: OTN54.T85KT
In Stock
$ 434.99 USD
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$ 434.99 USD
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The N54 engine is no stranger to oil cooling problems, that’s why we recommend installing the MSL Oil Thermostat. The standard oil thermostat will reach around 120 degrees Celsius with a normal driving style. The MSL Oil Thermostat will open at a lower temperature than the standard oil thermostat (at 85 degrees Celsius) and will keep the temperature stable between 95 and 105 degrees Celsius. Installing the MSL thermostat ensures a cooler oil temperature which will result in more stable performance, but above all this improves the reliability of the engine. It is recommended to install the thermostat, especially for cars that are tuned.
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Mahle-Behr Thermostat - 79º C - E34, E39, E52
Mahle-Behr Thermostat - 79º C - E34, E39, E52
Mahle - Corporate Logo
T#:341209
Part#: 11537835558
Ships in 1 Business Day
$ 74.00

This product was last offered at the strikethrough price on
06-05-2026

$ 61.49 USD
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$ 61.49 USD
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Includes sealing o-ring
Thermostat Housing W/ Thermostat Kit
Thermostat Housing W/ Thermostat Kit
Mahle - Corporate Logo
T#:567822
Part#: 11538674895
Ships in 1 Business Day
$ 181.30

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

$ 181.27 USD
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$ 181.27 USD
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Thermostat With Housing
Thermostat With Housing
Mahle - Corporate Logo
T#:594781
Part#: 11537605431
Ships in 1 Business Day
$ 128.36 USD
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$ 128.36 USD
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If your vehicle is experiencing cooling issues, chances are the thermostat is the cause. Common symptoms include prolonged warm-up at highway speeds from the thermostat being stuck open, or consistent overheating issues from the thermostat being stuck in the closed position. Either condition can result in poor performance, and potential damage to vital components in your vehicle.
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Thermostat With Housing
Thermostat With Housing
Mahle - Corporate Logo
T#:594783
Part#: 11537550172
Ships in 1 Business Day
$ 135.68

This product was last offered at the strikethrough price on
09-01-2026

$ 135.00 USD
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$ 135.00 USD
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Overheating your N52 or N54 engine can be detrimental to the longevity of your engine.
Mahle-Behr Thermostat - 92C - E34, E36, E39
Mahle-Behr Thermostat - 92C - E34, E36, E39
Mahle - Corporate Logo
T#:12476
Part#: 11537511083
In Stock
$ 30.99 USD
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$ 30.99 USD
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OEM BMW THERMOSTAT:115040
Thermostat - 80°C
Thermostat - 80°C
Mahle - Corporate Logo
T#:594727
Part#: 11531713040
Ships on Oct 23, 2026
$ 35.99 USD
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$ 35.99 USD
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The thermostat on your vehicle controls the flow of coolant based on temperature. When you just start your engine, the thermostat remains closed to accelerate the warm up process. After a few minutes, it opens up to allow the warm fluid to flow. If your vehicle is overheating but not blowing warm air from the heater, the problem is more than likely your thermostat.
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Thermostat - 80°C
Thermostat - 80°C
Mahle - Corporate Logo
T#:594737
Part#: 11531254065
Back Ordered
$ 22.99

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

$ 21.99 USD
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$ 21.99 USD
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The thermostat on your vehicle controls the flow of coolant based on temperature. When you just start your engine, the thermostat remains closed to accelerate the warm up process. After a few minutes, it opens up to allow the warm fluid to flow. If your vehicle is overheating but not blowing warm air from the heater, the problem is more than likely your thermostat.
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N55 Mosselman Billet Oil Thermostat - Black
N55 Mosselman Billet Oil Thermostat - Black
Mosselman Turbosystems - Corporate Logo
T#:50101777
Part#: 30210057
Ships in 8 Business Days
$ 399.00 USD
Free Shipping on orders $49 and up
Add to Wish List
$ 399.00 USD
Free Shipping on orders $49 and up
Add to Wish List
The N55 engine is no stranger to oil cooling problems, that’s why we recommend installing the MSL Oil Thermostat. The standard oil thermostat will reach around 120 degrees Celsius with a normal driving style. The MSL Oil Thermostat will open at a lower temperature than the standard oil thermostat (at 85 degrees Celsius) and will keep the temperature stable between 95 and 105 degrees Celsius. Installing the MSL thermostat ensures a cooler oil temperature which will result in more stable performance, but above all this improves the reliability of the engine. It is recommended to install the thermostat, especially for cars that are tuned.
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Mahle Thermostat - 80�C - E12, E23, E24, E28
Mahle Thermostat - 80�C - E12, E23, E24, E28
Mahle - Corporate Logo
T#:591826
Part#: 11539055588
Back Ordered
$ 28.99 USD
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$ 28.99 USD
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Stop your overheating problem.

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