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, 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 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.

Note: The Oil Thermostat Installation kit prevents the Oil Thermostat from leaking and is highly recommended when installing the MSL Oil Thermostat. The kit includes 2 x O-ring for the oil hose and 1x rubber oil filter housing gasket. We advise to add it to your order. 

MSL OIL THERMOSTAT

The next level of temperature control

• 20°C/68F Lower Than Stock
  Operating temperature 20°C/68F lower than stock.
   
• Real Thermostat
  Equipped with a real thermostat, not an always open solution. (for use in hot and cold climates)
   
• Rock Solid Housing
  Made out of a solid block of high-grade aluminum.
   
• Quick Installation
  Takes only 30 minutes to install.

ABOUT MOSSELMAN

Mosselman Turbo Systems is a Dutch manufacturer of high-quality performance parts designed specifically for use in BMW and Mini cars. If you own a BMW or a Mini, you can bet your bottom dollar we have the parts you need to make it go faster. Whether it’s intercoolers, turbochargers, downpipes, engine management systems or even full exhausts systems, Mosselman Turbo Systems has a wide selection of carefully made performance parts for your car. 

Furthermore, Mosselman Turbo Systems has been in the tuning business for over 40 years and the vast majority of our products has been designed, tested and manufactured in-house. These are our products and we stand by them.

Note: You will need the N54 Oil Thermostat for the E-Series 135i and 335i with the N55 engine.

You can Download the Installation Manual here.