BMW
Mosselman S55 Oil Thermostat 85c (Inc. M2 Competition, M3 & M4) - Silver
Mosselman S55 Oil Thermostat 85c (Inc. M2 Competition, M3 & M4) - Silver
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Keep Your M Power Oil Temps Under Control
Give your BMW twin turbo straight-six the thermal management it deserves with this 85°C thermostatic oil control upgrade. Designed for high performance road and track use, it drops the OEM control point by roughly 20°C, helping curb heat soak, stabilise lubrication temperature and support reliable power on S55, plus N54 and N55 applications. Silver finish and a direct replacement fit make it a clean, factory-like upgrade that transforms confidence behind the wheel.
Why enthusiasts choose this cooler-running oil stat
- Opens at 85°C for earlier oil flow through the cooler compared to the stock unit.
- Typical operating range held around 95 to 105°C depending on vehicle specification and conditions.
- True thermostatic control - not a permanently open bypass - so warm-up remains efficient in all seasons.
- Helps protect bearings, turbos and seals during hard driving, remapped setups and track days.
- Improves consistency for fast road, sprint and circuit work by resisting temperature creep.
Built to take the heat
- CNC machined from a solid block of high-grade aluminium for maximum strength and durability.
- Silver finish for a clean OEM-plus look in the engine bay.
- Plug-and-play replacement that works with the factory oil cooler system and lines.
- No compromise daily drivability with quicker cooling when you need it and proper control when you do not.
What is included
- 1 x 85°C oil thermostat assembly
Fasteners and gaskets are not included. We strongly advise new O-rings for the oil hoses and a fresh oil filter housing gasket at the same time. An engine oil change must be carried out during installation.
Fitment
- BMW M2 Competition F87 - S55
- BMW M3 F8x - S55
- BMW M3 Competition F80 - S55
- BMW M3 CS F80 - S55
- BMW M4 F8x - S55
- BMW M4 Competition F82 - S55
- BMW M4 CS F82 - S55
- BMW M4 GTS F82 - S55
Also fits BMW F30 330e and ActiveHybrid 3 with the N55 engine.
Installation and support
Simple, direct-fit replacement that a competent technician can install quickly. For a seamless experience, book professional fitting with MJ Modifications in Warwickshire. Request a quote at info@mjmodifications.co.uk.
Real-world results
We run this lower-temp oil stat on our own builds and customer cars. Feedback is consistently positive - steadier oil temps, greater confidence on spirited drives and improved headroom for tuned engines.
Compatibility check
We are happy to verify fitment before dispatch. Provide your UK registration or the last 7 of your VIN at checkout and our team will confirm compatibility.
Part number
030210060
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