Skip to content
Lion Yard Trading
Mercedes-Benz · Engine

Oil cooler seals

The O-rings sealing the engine oil cooler where oil and coolant run side by side.

How you know it is this

  • Oil in the coolant expansion tank, or coolant in the oil
  • A milky film that is NOT accompanied by overheating or white exhaust smoke

Worth knowing before you buy

  • Oil and coolant mixing does not automatically mean a head gasket. On several Mercedes engines these seals are the far more likely and far cheaper cause.
  • Cheap part, significant labour, so worth doing with anything else in that area.
  • The cooling system needs flushing afterwards — oil in coolant ruins the rest of the system if it is left.

What we need to quote it. The engine code. The chassis number settles the generation, the body and usually the engine in seventeen characters — it is on your mulkiya. A photograph of the old part helps where there is more than one version.

Piston, rings and pinConnecting rod and shellsCrankshaft and mainsEngine blockCrank pulley / damperFlywheel and ring gearSeals and gasketsSump and gasket
Block and rotating assembly — schematic, to show where the part sits. Arrangement is right; it is a diagram and not a fitment reference.

Rest of the gaskets and seals

All engine parts
Get in touch

Oil cooler seals for your Mercedes-Benz?

Send the chassis number and a photograph of the old part. We come back with genuine, OEM and aftermarket options priced side by side, with lead times.

Mon–Sat, 8:00 AM – 6:00 PM · +971 54 303 3119 (Operations Director) · +971 54 241 0599 (Managing Director)