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Mark Hendrikx - Automotive engineer at Mosselman

Expert's advice:

Mosselman Oil Thermostat N54, black

The BMW N54 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 N54 engines, especially when they’re tuned. 

The Mosselman Oil Thermostat for the N54 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 N54 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. For more demanding applications, we also offer dedicated oil cooler kits for the BMW 1-Series E8x and BMW 3-Series E9x models. These kits are designed for vehicles that are pushed to their limits, such as during track use, where maximum cooling capacity is required to support sustained high-performance driving.

  • 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 N54 Type Engine Note
BMW 135i E82 N54  
BMW 135i E82 N55 This is an N55 engine, but it needs the Mosselman N54 thermostat to make it fit into the car!
BMW 1M E82 N54  
BMW 335i E90/E91/E92 N54  
BMW 335i E90/E91/E92 N55 This is an N55 engine, but it needs the Mosselman N54 thermostat to make it fit into the car!
BMW Z4 35i E89 N54  
BMW Z4 LCI 35i E89 N54  
BMW Z4 35is E89 N54