Mosselman S55 Oil Thermostat 85c (Inc. M2 Competition, M3 & M4) - Silver

Keep Your S55 Running Cooler, Longer and Stronger

Reduce excessive oil temperatures and protect your engine with this 85°C low-temperature oil stat for BMW S55 powertrains. Designed as a direct-fit, plug-and-play upgrade with a premium silver billet aluminium housing, this precision-built unit opens earlier than the factory item to stabilise oil temps around 95 to 105°C depending on vehicle, rather than letting them creep toward the typical 120°C seen in everyday driving. The result is consistent performance, improved reliability and reassurance on fast road and track days, especially on remapped or hard-driven cars.

Our team has installed this on customer cars and our own builds and the feedback is outstanding. Drivers report steadier oil temperature, more confidence on spirited runs and better longevity for highly stressed turbocharged engines.

Why Upgrade

• Lower operating oil temperature for S55 engines - ideal for spirited driving and track use
• Helps maintain oil viscosity under load for bearing and turbo protection
• Consistent power delivery with reduced heat soak on tuned setups
• No compromise in warm-up - real thermostat design, not an always-open workaround
• Direct replacement for the OE unit - no coding, no fuss

Key Features

• Opens at 85°C - approximately 20°C lower than the stock calibration
• Stable oil temps typically 95 to 105°C depending on model and conditions
• Real wax-stat thermostat - suitable for hot and cold climates
• CNC-machined from high-grade aluminium with a durable silver finish
• Quick installation with basic tools

Compatibility

• BMW M2 Competition F87 - S55
• BMW M3 F80 - S55 including Competition and CS
• BMW M4 F82 F83 - S55 including Competition, CS and GTS

Also suitable for selected N55 and N54 applications that use the same housing design, including BMW F30 330e and ActiveHybrid 3 with N55. If you are unsure, contact us and we will confirm fitment against your reg or last 7 of VIN.

What You Get

• 1 x 85°C performance oil thermostat assembly

Note: Seals and bolts are not included. We recommend fresh O-rings for the oil cooler lines and a new oil filter housing gasket during installation, plus new hardware if required.

Installation and Advice

• Direct-fit replacement - plug-and-play
• We recommend fitting with an oil and filter change
• Ideal time to refresh O-rings and housing gasket to prevent leaks

Want it fitted properly first time? Book our professional installation service at MJ Modifications in Warwickshire. Email info@mjmodifications.co.uk for a quote and availability.

Perfect For

• BMW S55 cooling upgrade
• Track day preparation
• Stage 1 and Stage 2 tuned cars
• Fast road heat management and reliability

Part Number

030210060

Search-friendly Terms

BMW M2C oil temp thermostat, F80 M3 oil temperature regulator, F82 M4 low temp oil stat, S55 billet aluminium thermostat silver, 85 degree oil thermostat upgrade, BMW oil cooler thermostat, direct fit oil stat S55, performance oil temperature control, track day cooling mod, engine protection for tuned S55.