$595.00 USD
$595.00 USD












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This Kit Includes the Gasket, O Rings, and Titanium Bolts needed for installation.
Your VIN must be provided to ensure accurate order fulfillment.
The N54, N55 and S55 engines are no strangers 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, depending on the car model.
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 highly recommended to install the thermostat, especially for cars that are tuned.
Kies Youtube install video of Mosselman thermostat on M4 GTS
A highly recommended upgrade for N54, N55 and S55 engines.
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.
Additionally to the thermostat we have oil cooler kits for the 1-Series E8x and the 3-Series E9x. We advise the Oil Cooler Kit for cars that use the full performance of the car during track use. The kits are available as single or twin cooler kits. The single cooler kit replaces the OEM cooler on the right side of the car, the twin kit will add an extra cooler on the left side of the car.
| Vehicle | Chassis | Engine |
| MSL Oil Thermostat N54 | ||
| BMW 135i | E82 | N54 |
| BMW 135i | E82 | N55 |
| BMW 1M | E82 | N54 |
| BMW 335i | E90 | N54 |
| BMW 335i | E90 | N55 |
| BMW Z4 35i | E89 | N54 |
| BMW Z4 LCI 35i | E89 | N54 |
| BMW Z4 35is | E89 | N54 |
| MSL Oil Thermostat N55 | ||
| BMW M135i | F20/F21 | N55 |
| BMW M235i | F22 | N55 |
| BMW M2 | F87 | N55 |
| BMW 335i | F30/F31 | N55 |
| BMW 335i GT | F34 | N55 |
| BMW 435i Gran Coupe | F36 | N55 |
| BMW 435i | F32/F33 | N55 |
| MSL Oil Thermostat S55 | ||
| BMW M2 Competition | F87 | S55 |
| BMW M3 | F8x | S55 |
| BMW M3 Competition | F80 | S55 |
| BMW M3 CS | F80 | S55 |
| BMW M4 | F8x | S55 |
| BMW M4 Competition | F82 | S55 |
| BMW M4 CS | F82 | S55 |
| BMW M4 GTS | F82 | S55 |
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$595.00 USD
$595.00 USD
This product can expose you to chemicals such as lead and lead compounds, which are known to the State of California to cause cancer or birth defects or other reproductive harm. For more information, visit www.P65Warnings.ca.gov.
For a complete list of chemicals known to cause harm, visit https://www.p65warnings.ca.gov/chemicals.
Under the federal Clean Air Act (42 U.S.C. §7522(a)(3)), it is illegal to manufacture, sell, install, or use any part that defeats or alters a motor vehicle’s emission control system for use on public roads. Unless a product has received an Executive Order (EO) from the California Air Resources Board (CARB), it is not legal for use or installation on any pollution-controlled vehicle driven on public highways.
Some states have CARB-equivalent or independent emissions laws. Customers are responsible for verifying local regulations before purchasing or installing emissions-related products.
All performance, racing, or competition parts sold by this company are intended solely for off-road, closed-course, or competition use on vehicles that are never registered or used on public highways.
Kies Motorsports, LLC sells and markets these products for lawful use only. We do not condone or authorize the use of emission-control defeat devices or any modification that violates the Clean Air Act or state regulations.