BMW Thermostats

Mosselman S55 Billet Oil Thermostat - Silver - BMW F8X S55 3.0L ...

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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N54 & E8x/E9x N55 Mosselman Billet Oil Thermostat

For Gasket/Install kit see T#4799665

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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N55 Mosselman Billet Oil Thermostat

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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Mosselman Billet Oil Thermostat With Installation Kit

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 - 79Âº C - E34, E39, E52

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

Aluminum Thermostat Housing Kit - M50

T#:397222

Part#: 14-009

Ships in 10 Business Days

$ 56.99 USD

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$ 56.99 USD

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Plastic thermostat housing cracked on your M50?

Here are your choices: you can wait for the plastic factory thermostat housing cover to break and cause major overheating. (Even with a new stock cover, it won’t take long.) Or you can install a thoughtfully engineered all-aluminum thermostat housing cover from Active Autowerke and never experience this type of failure again. Currently there is no factory upgraded part to this problem. This is an aluminum extruded part that has all of the openings machine properly to fit like factory; from the mounting bolt holes, the seating of the thermostat to the sealing opening for the ORANGE gasket. Forged to exact factory tolerances, everything fits and this unit is a true easy bolt-on – especially suited for racing or load conditions like heavy traffic, where engine temp can rise rapidly. The housing is guaranteed never to break from overheating or over-tightening, and its CNC machined surface ensures a precise seat.

Unit comes complete with a new ORANGE sealing gasket; a new thermostat is recommended but not included.
For hotter climates, a 71 degree thermostat is recommended over the 82 degree unit.

Anything and everything BMW is the mantra at Active Autowerke. Since 1981 they have been serving the BMW community with custom turbocharger kits to a myriad of other innovative and inspiring performance parts.

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Thermostat Housing W/ Thermostat Kit

T#:567822

Part#: 11538674895

Ships in 1 Business Day

$ 186.63 USD

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$ 186.63 USD

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Thermostat With Housing

T#:594781

Part#: 11537605431

Ships in 1 Business Day

$ 130.49 USD

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Qty

$ 130.49 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

T#:594783

Part#: 11537550172

Ships in 1 Business Day

$ 137.25 USD

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$ 137.25 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

T#:12476

Part#: 11537511083

In Stock

$ 30.99 USD

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$ 30.99 USD

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OEM BMW THERMOSTAT:115040

Active Autowerke Thermostat Bypass/Delete Tube - S65

T#:2302749

Part#: 14-016

Ships in 10 Business Days

$ 141.99 USD

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$ 141.99 USD

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CNC machined coolant/water thermostat bypass tube to improve flow on and off the track. Easy plug and play installation and a durable anodized coating make this a simple and reliable temperature control solution.

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Thermostat - 80°C

T#:594727

Part#: 11531713040

Ships on Nov 10, 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

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

T#:50101777

Part#: 30210057

Ships in 7 Business Days

$ 399.00 USD

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Qty

$ 399.00 USD

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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 - 80ï¿½C - E12, E23, E24, E28

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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Mosselman S55 Billet Oil Thermostat - Silver - BMW F8X S55 3.0L ...

N54 & E8x/E9x N55 Mosselman Billet Oil Thermostat

N55 Mosselman Billet Oil Thermostat

Mosselman Billet Oil Thermostat With Installation Kit

Mahle-Behr Thermostat - 79Âº C - E34, E39, E52

Aluminum Thermostat Housing Kit - M50

Thermostat Housing W/ Thermostat Kit

Thermostat With Housing

Thermostat With Housing

Mahle-Behr Thermostat - 92C - E34, E36, E39

Active Autowerke Thermostat Bypass/Delete Tube - S65

Thermostat - 80°C

Thermostat - 80°C

N55 Mosselman Billet Oil Thermostat - Black

Mahle Thermostat - 80ï¿½C - E12, E23, E24, E28

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