Mosselman MSL 85°C Low-Temperature Oil Thermostat Upgrade BMW N55 F-Series: M2 F87, M135i F20/F21, M235i F22, 335i F30/F31/F34, 435i F32/F33/F36 Reduces Oil Temps, Direct Fit

Mosselman 85°C Performance Oil Stat for BMW N55 F-Series

Bring your N55’s oil temperature under control with the Mosselman 85°C performance oil thermostat. This drop-in thermostatic oil housing is the proven solution for keeping lubrication temperatures in the sweet spot on fast road, track day and tuned BMWs. Expect cooler, steadier readings and repeatable performance pull after pull.

Unlike workaround plates that leave the circuit permanently open, this is a genuine thermostatically controlled unit. It starts regulating at 85°C, helping maintain oil in the mid-90s to low-100s Celsius range depending on vehicle and conditions. That means stronger protection for bearings and turbochargers, reduced heat soak, and confidence for spirited B-road drives, autobahn stints and circuit use.

Why enthusiasts choose this upgrade

• 85°C opening temperature for improved oil temperature management on the N55
• Consistent thermal control for tuned cars, hybrid turbo builds and Stage 1 or Stage 2 software
• Retains proper warm-up behaviour while preventing oil from running excessively hot
• CNC-machined billet aluminium body for strength and longevity
• Direct swap, no coding or mapping changes required
• Ideal partner for spirited road use, track days and endurance driving

We’ve used this thermostat on our own N55 builds and customer cars at MJ Modifications, and the results are exactly what you want: lower peak readings, quicker recovery after hard pulls and rock-solid consistency session after session. Our customers love the peace of mind and the way the car holds power when pushed.

Vehicle applications

• BMW 1 Series F20 F21 M135i with N55
• BMW 2 Series F22 M235i with N55
• BMW M2 F87 with N55
• BMW 3 Series F30 F31 335i with N55
• BMW 3 Series GT F34 335i with N55
• BMW 4 Series F32 F33 435i with N55
• BMW 4 Series Gran Coupe F36 435i with N55

Fitting and maintenance

This is a plug-in replacement for the factory oil stat housing. For best results, install with fresh seals and the correct oil filter housing gasket to ensure a leak-free job. Professional installation recommended.

Want expert fitting? Book your install with MJ Modifications in Warwickshire. Request a quote: info@mjmodifications.co.uk.

Perfect for

• N55 heat management on road and track
• Remapped and bolt-on performance builds
• Drivers chasing consistency, reliability and protection

Search terms customers use

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