MMR Performance Low Temp Oil Thermostat Insert for BMW N54/N55 (2008+) | Uprated Oil Stat, Early-Opening Billet Regulator | Fits 135i 335i 435i M135i M235i (E82 E90 F20 F30 F32) | Direct-Fit to OE Housing | Track/Road Oil Cooling Upgrade

Uprated Oil Stat for BMW N54 and N55 - cooler running for fast road and trackday use

Keep your turbocharged straight-six happy with the MMR Performance uprated oil stat. This early-opening thermostat regulates lubrication temperatures in the ideal 90°C to 110°C window, delivering stable oil temps when you are pushing hard. It is a smart, great-value cooling solution for mapped and higher output builds without the expense and complexity of an auxiliary oil cooler.

Why choose this early-opening thermostat

• Reduces heat stress on bearings, turbochargers and seals for added durability
• Helps maintain consistent viscosity and oil pressure during spirited driving
• Perfect for tuned cars that see frequent hard use and track sessions
• Drops straight into the factory housing for a quick, hassle-free install
• Cost-effective thermal management upgrade compared with external cooler kits

Engineered for tough use

• Precision machined from aircraft-grade T-6061 aluminium for strength and accuracy
• Hard anodised in MMR’s Dark Anthracite finish for long-lasting corrosion resistance
• Calibrated to open earlier than stock to keep oil temperatures controlled under load
• Designed specifically for BMW N54 and N55 applications and the OE thermostat housing

We run this unit on our own builds and feedback from customers has been excellent. Expect dependable oil temperature control on hot days, lap after lap consistency and real peace of mind when leaning on your 135i, 335i, 435i, M135i or M235i.

Compatibility - 2008 onwards

For BMW models using the N54 or N55 engine, including:

• 1 Series E82 E88 F20 F21 - 135i, M135i, M135i xDrive
• 2 Series F22 F23 - M235i, M235i xDrive
• 3 Series E90 E91 E92 E93 F30 F31 - 335i, 335xi, 335i xDrive
• 4 Series F32 F33 - 435i, 435i xDrive

Fitting and support

Installs into the stock thermostat housing with no additional lines or brackets. For professional installation, book with MJ Modifications in Warwickshire. Request a fitting quote at info@mjmodifications.co.uk.

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