Leaking Oil Filler Cap

[Len7]

Recently I found oil on the top of the engine and a small leak under the car overnight after a run.

The oil had run down the engine.

I was surprised to find it was a small leak from the oil filler cap

This was a new one on me - I have never known an oil filler cap to leak.

Anyway I replaced the cap and all is well.

Thought I would just share this in case anyone has same problem and it may help them diagnose it quicker.

I am sure GJN and others will have come across this but as I say it was a surprise to me.

[gjnorthall]

Good point. It's unusual for the cap to leak oil - it's more usual to pull in air when the seal perishes. This upsets the PCV system and can give running problems.