Mosselman Oil Thermostat

The next level of temperature control

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.

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A highly recommended upgrade

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.

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 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

Do you have a question?

Please take a look at our FAQ for the most commonly-asked questions, or feel free to contact us.

Yes, 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.

Yes, we highly recommend replacing the gasket and 0-rings to prevent the thermostat from leaking. We have an installation kit available, it includes 2 x O-ring for the oil hose and 1x rubber oil filter housing gasket. We advise to add it to your order.

The thermostat is plug-and-play, which means that you don't have to make modifications to install the thermostat. Just remove the old one and replace it with our Mosselman Oil Thermostat. The installation time will be approximately 30 minutes.

MOSSELMAN tuning experiences

My first impressions after the remap: the acceleration is much more dynamic, it feels like the car now has the powertrain that fits it well! I’m very satisfied with your service, explanations, and friendly approach. Thank you!

Dennis - BMW X5 40e
Mosselman tuned my BMW 318d today. What a result, it became a completely different car! Very professional company and friendly staff. This was my second car here and again they have exceeded my expectations. Thanks!

Thom H.
Very happy with my improved car, the car reacts better on the throttle and is very direct. Also, the exhaust sounds better!

Rob M.
With Mosselmans' performance package I exceeded even more than the company advertised on their website! The information-sharing process was easy and hassle-free. Excellent customer service from Leon and his team!

Anders M.
After 1,5 years still very happy with my iTronic. By far the best upgrade I could have done with my BMW 340i.

Romke B.