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Mosselman

Mosselman MSL Titanium GR5 Hex-Race Oil Thermostat Bolt Set for BMW N54 N55 S55 (M8 x 25mm, 3x) - Fits M135i M235i 335i 435i Z4 35i M2 M3 M4

Mosselman MSL Titanium GR5 Hex-Race Oil Thermostat Bolt Set for BMW N54 N55 S55 (M8 x 25mm, 3x) - Fits M135i M235i 335i 435i Z4 35i M2 M3 M4

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Mosselman MSL Titanium GR5 Hex-Race Fastener Set for BMW Oil Thermostat Housing

Give your BMW’s oil thermostat housing the motorsport treatment with this genuine Mosselman MSL titanium fastener set. Engineered from Ti-6Al-4V Grade 5 for outstanding strength-to-weight and heat resistance, these race-spec hex head fixings are a precise OEM replacement for the original thermostat cover screws on N54, N55 and S55 engines. Ideal for spirited road driving and track-day use, they deliver dependable clamping, crisp torque feel and stainless-like corrosion resistance in a fraction of the weight of steel hardware.

We run these titanium bolts on our own builds and customer cars. Feedback has been excellent, with consistent torque accuracy during installation and faultless reliability across repeated heat cycles. If you are refreshing the thermostat housing or fitting a Mosselman unit, this is the smart upgrade over standard steel bolts.

Why choose this titanium bolt kit

  • Ultra strong Ti-6Al-4V Grade 5 construction for high tensile performance
  • Significantly lighter than steel fixings to trim engine bay mass
  • Excellent heat and oxidation resistance for high temperature environments
  • Hex head design for positive tool engagement and consistent torque application
  • Direct swap for factory thermostat cover screws on N54, N55, S55
  • Perfect for tuned engines, fast road and circuit use
  • Correct size and thread: M8 x 25 mm

What you receive

  • 3 x M8 x 25 mm Grade 5 titanium hex bolts

Fitment coverage

Designed for BMW models using N54, N55 and S55 engines, including but not limited to:

  • 1 Series: 135i E82 N54, 135i E82 N55, 1M E82 N54, M135i F20 F21 N55, M235i F22 N55
  • 2 Series: M2 F87 N55, M2 Competition F87 S55
  • 3 Series: 335i E90 E91 E92 N54, 335i E90 E91 E92 N55, 335i F30 F31 N55, 335i GT F34 N55
  • 4 Series: 435i F32 F33 N55, 435i Gran Coupe F36 N55
  • Z4: 35i E89 N54, 35i LCI E89 N54, 35is E89 N54
  • M cars: M3 F80 S55 including Competition and CS, M4 F82 F83 S55 including Competition, CS and GTS

Chassis keywords for search: E82, E90, E91, E92, E89, F20, F21, F22, F30, F31, F34, F32, F33, F36, F80, F82, F83, F87.

Installation

Direct replacement fasteners for the oil thermostat housing. We recommend torquing to factory specifications. A light application of suitable anti-seize on titanium threads is good practice.

Need fitting or a quote for installation and fluids at the same time? Book with MJ Modifications in Warwickshire. Email info@mjmodifications.co.uk.

Compatibility check

We can verify fitment before dispatch. Add your UK registration or the last 7 digits of your VIN at checkout.

Trusted UK supplier

We stock genuine Mosselman hardware and ship quickly across the UK. Popular search terms: BMW oil thermostat bolts, thermostat housing screws, titanium fasteners for N54 N55 S55, M2 M3 M4 titanium hardware, M8x25 thermostat cover bolts, BMW performance parts UK, cooling system hardware upgrade, race spec bolt kit.

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