Mosselman 85C Low Temp Oil Cooler Thermostat - S55 Billet Black Edition - BMW M2 Competition/M2C, M3, M4 (F87 F80 F82 F83, F8X) - Cooler Stat Track Cooling Mod - Direct Fit Plug & Play - Also fits 330e/ActiveHybrid 3 (N55)

Keep your S55 running cooler, safer and stronger

Take control of oil temperature on your BMW M2 Competition, M3 and M4 with this 85°C low-temperature stat in the Black Edition finish. Designed for the S55 twin-turbo straight-six, it opens earlier than the factory unit to curb excessive heat on fast road and track, improving consistency and engine longevity without compromising warm-up.

Why upgrade your S55’s temperature control

• Opens at 85°C to reduce peak oil temps by around 20°C versus stock, helping avoid heat soak and limp mode on spirited drives and circuit sessions.
• Stabilises operating temperatures typically around 95 to 105°C depending on vehicle, supporting reliable performance in summer and winter.
• Ideal for remapped, Stage 1, Stage 2 and track-focused builds where oil temperature management is critical.

Engineered for performance and reliability

• CNC-machined from a solid block of high-grade aluminium for a robust, leak-resistant housing.
• True thermostatic control, not a permanently open workaround, so warm-up times stay close to OEM for everyday drivability.
• Direct replacement, plug-and-play fitment. Typical install time around 30 minutes.
• Sleek Black Edition finish to complement a clean engine bay.

Real-world results

We’ve fitted this uprated unit to our own and customer S55 cars and the feedback is consistently positive: cooler running on B-road blasts, tighter temperature control on extended pulls, and far more confidence during track days. It’s a simple, high-impact upgrade for any F8X owner.

What’s included

• 1 x 85°C low-temperature thermostat assembly

Gaskets and bolts are not included.

Recommended extras

• Installation kit to prevent leaks: includes 2 x oil hose O-rings and 1 x oil filter housing rubber gasket.
• Titanium GR5 Hex-Race bolt set for a premium, corrosion-resistant fastener upgrade.

Note: An engine oil change is required at the same time as installation.

Vehicle fitment

• BMW M2 Competition F87 (S55)
• BMW M3 F80, F80 Competition, F80 CS (S55)
• BMW M4 F82/F83, Competition, CS, GTS (S55)

Also compatible with BMW F30 330e / ActiveHybrid 3 with the N55 engine.

Fitting and support

For professional installation, book with MJ Modifications in Warwickshire. Request a fitting quote at info@mjmodifications.co.uk. We can also carry out a compatibility check using your UK registration or the last 7 digits of your VIN prior to dispatch.

Key benefits at a glance

• Lower running temps for the S55 engine
• Enhanced reliability on tuned and stock cars
• Consistent performance on fast road and track days
• Direct-fit, hassle-free installation
• Durable billet aluminium housing

Search terms you might know this by

BMW M2C M3 M4 low temp thermostat, S55 cooler stat, F80 F82 F83 F87 oil temp fix, S55 oil temperature upgrade, billet thermostat housing, Black Edition 85 degree stat, track day cooling mod, performance cooling upgrade, direct replacement thermostat, plug-and-play S55 cooling.

Part number

030210062