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Mercedes-Benz · Engine

Breather and PCV valve

The system that vents pressure out of the crankcase and returns the fumes to the inlet to be burned.

Also called crankcase breather, PCV, oil separator.

How you know it is this

  • Oil leaks appearing at several seals at once
  • A whistle from the engine at idle
  • The oil filler cap being hard to remove, or being sucked down
  • Blue smoke and high oil consumption
  • A rough idle with a lean code

Worth knowing before you buy

  • THIS IS THE PART BEHIND MOST 'MYSTERY' OIL LEAKS. A blocked breather pressurises the crankcase and pushes oil out of whichever seal is weakest. Replacing that seal without fixing the breather just moves the leak.
  • The diaphragm is often built into the cam cover, so the two jobs are the same job.
  • Cheap, and worth checking any time more than one seal is weeping.

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.

Belt, tensioner and idlersEngine mountsGearbox mountBreather / PCVVacuum pump and linesCovers and undertray
Mounts, belt and breather — schematic, to show where the part sits. Arrangement is right; it is a diagram and not a fitment reference.

Rest of the mounts and ancillaries

All engine parts
Get in touch

Breather and PCV valve 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)