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Mark Hendrikx - Automotive engineer at Mosselman

Expert's advice:

Mosselman Oil Thermostat N55, red

The BMW N55 engines are no strangers to oil cooling problems, that’s why we recommend installing the Mosselman Oil Thermostat. The standard OEM oil thermostat will reach around 120 degrees Celsius (248°F) with a normal driving style. The Mosselman Oil Thermostat will open at a lower temperature than the standard oil thermostat (at 85 degrees Celsius/185°F), which results in an operational oil temperature 20°C (68°F) lower than OEM. *Exact temperatures can differ slightly depending on the engine type. Installing the Mosselman Oil Thermostat ensures a cooler oil temperature which will result in more stable performance, but above all this improves the reliability of the engine. A highly recommended upgrade for the BMW N55 engines, especially when they’re tuned. 

The Mosselman Oil Thermostat for the N55 engine is available in 4 beautiful colors: aluminum, black, red or blue.

Note: For a reliable and hassle-free installation, we strongly recommend adding the Oil Thermostat Installation Kit to your order. It is specifically designed to ensure a proper seal and prevent leaks when installing the Mosselman Oil Thermostat. The kit includes two O-rings for the oil hoses and a rubber gasket for the oil filter housing, providing everything needed for a secure and durable fit.

Mark Hendrikx - Automotive engineer at Mosselman

A highly recommended upgrade for the BMW N55 engine

The Mosselman Oil 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.

The oil thermostat is recommended for sporty street driving, where maintaining stable oil temperatures is essential for both performance and engine longevity.

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

  • 20°C (68°F) Lower Than Stock
    Operating temperature 20°C (68°F) lower than stock.
     
  • CNC Machined Housing
    Made out of a solid block of high-grade aluminum.
     
  • 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.

INSTALLATION MANUAL MOSSELMAN OIL THERMOSTAT

Available in 4 beautiful colors:

Aluminium Thermostat

 

Black Thermostat

 

Red Thermostat

 

Blue Thermostat

Technical details

Compatibility Mosselman Oil Thermostat N55 Type Engine
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  F32/F33 N55
BMW 435i Gran Coupe F36 N55
Note: You will need the N54 Oil Thermostat for the E-Series 135i and 335i with the N55 engine.