Mosselman MSL Oil Thermostat Installation Seal Kit for BMW N54 N55 S55 - O-Rings & Oil Filter Housing Gasket | Fits 135i 335i 435i M135i M235i M2 M3 M4 Z4 35i | E82 E90 E92 F30 F32 F80 F82 F87

Seal Kit for Mosselman MSL Thermostat - BMW N54 N55 S55

Replace the tired sealing rings and the oil filter housing gasket during your Mosselman MSL thermostat fitment and keep your turbocharged BMW running clean and dry. This simple seal pack tackles the common oil weep at the thermostat and oil filter housing on N54, N55 and S55 engines, making it a smart add-on for anyone upgrading the oil temperature control valve or refreshing the cooling-oil system.

We have fitted this kit on customer cars and our own builds at MJ Modifications and the results have been consistently excellent. Clean mating surfaces, fresh O-rings and a new oil filter housing gasket mean a reliable, leak-free outcome that protects oil pressure and keeps temperatures in check for daily driving, fast road and track.

Key reasons to choose this seal pack

• Stops oil misting and drips around the thermostat body and oil filter housing
• Correct-size sealing rings for the oil cooler lines on N54, N55 and S55 engines
• Fresh oil filter housing gasket to replace flattened, heat-cycled originals
• Essential when fitting or servicing a Mosselman MSL oil temperature regulator
• Low-cost insurance for a clean, professional finish and long-term reliability

What you receive

• 2 x O-rings for the oil cooler hose connections
• 1 x Rubber oil filter housing gasket

Vehicle applications

For BMW turbo straight-six models with N54, N55 and S55 engines, including but not limited to:

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

Chassis codes covered include E82, E90, E92, E89, F20, F21, F22, F30, F31, F32, F33, F34, F36, F80, F82, F87.

Ideal searches and related terms

BMW oil filter housing gasket replacement N54, OFHG fix N55, S55 oil cooler line O-rings, thermostat housing seal set BMW, Mosselman MSL thermostat seal pack, oil temp regulator gasket kit, BMW oil cooler hose seals, N54 oil leak repair kit, N55 oil filter housing reseal, S55 gasket oil cooler, BMW inline six oil thermostat seals, performance oil system refresh kit.

Fitting and support

Professional installation available at MJ Modifications in Warwickshire. Request a quote at info@mjmodifications.co.uk. We recommend replacing these seals whenever you fit or service a Mosselman MSL thermostat on N54, N55 or S55 engines for a dependable, leak-free result.

Why buy this kit

It is the right hardware, in the right sizes, for a stress-free install. Customers report dry joints, stable oil pressure and zero mess after replacement. Add this to your basket with your Mosselman MSL thermostat for a complete, professional-grade solution.