The BMW N54, N55, and S55 engines are no strangers to oil cooling problems, that’s why we recommend installing the Mosselman Oil Thermostat. Instead of opening at 105°C (220°F), the Mosselman Oil Thermostat opens at 85°C (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 N54, N55, and S55 engines, especially when they’re tuned.
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 sportive street use. Additionally to the thermostat, we have oil cooler kits for the BMW 1-Series E8x and the BMW 3-Series E9x for cars that use the full performance of the car during track use. The kits are available as a single or a twin extension cooler kit. 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.
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20°C (68°F) Lower Than Stock
Operating temperature 20°C (68°F) lower than stock.
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CNC Machined Housing
Made out of a solid block of aluminum.
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Real Thermostat
Equipped with a real thermostat, not an always open solution. (for use in hot and cold climates)
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Quick Installation
Takes only 30 minutes to install.