Mosselman MSL Oil Thermostat Upgrade for BMW N55 – F87 M2, M135i, M235i, 335i, 435i
Fix high oil temperatures on your BMW N55 with the Mosselman MSL Oil Thermostat. This low temperature oil thermostat is the proven cooling upgrade for BMW F-series N55 engines, designed to stabilise oil temps and improve reliability on both road and track. Perfect for tuned and remapped cars, as well as hard-driven daily drivers that suffer with high oil temperature and heat soak.
The factory N55 oil thermostat typically allows oil temps to climb to around 120°C during normal driving. The Mosselman MSL Oil Thermostat opens earlier at 85°C and keeps oil temperatures far more controlled, typically between 95 and 105°C depending on model. Cooler, more stable oil temperatures support consistent performance and long-term engine protection.
- Direct replacement low temperature thermostat for BMW N55 – plug-and-play install
- Opens at 85°C to reduce peak oil temps and improve thermal management
- Stabilises oil temperature around 95 to 105°C depending on vehicle
- Machined from a solid block of high-grade aluminium for durability
- Real thermostat unit, not an always open workaround
- Oil reaches operating temperature in similar time to the OEM thermostat
- Highly recommended for tuned, remapped or track-driven N55 engines
At Nforcd we run this thermostat on our own N55 cars and customer builds. Feedback has been excellent, with noticeably lower oil temps and improved consistency during spirited driving and track sessions.
Installation Kit Recommendation
For a leak-free install, we highly recommend adding the Oil Thermostat Installation Kit. It prevents leaks and includes the correct seals: 2 x O-ring for the oil hose and 1 x rubber oil filter housing gasket.
Compatibility
- 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
Why choose this N55 oil thermostat
- Reduces oil temperature compared to the OEM thermostat
- Enhances engine reliability under load and repeated pulls
- Ideal for Stage 1 and Stage 2 N55 cars where extra heat is generated
- Simple, effective upgrade that complements other cooling mods
Professional fitting available
Want it fitted by experts who know BMW N55 cooling inside out? Nforcd offers professional installation in Warwickshire. Request a fitting quote at Sales@nforcd.com.
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