[svx_commuter]

Originally Posted by oab_au

Valve guides and seals don't start leaking "suddenly", it is a very gradually process.
It is more likely that the oil has come from the inlet manifold, through the crankcase ventilation system.

Harvey.

Okay I want to know. How does the oil get into the crankcase ventilation system?

I will take a guess... The PCV valve would be working well, manifold vacuum would be high and the oil flow into the crank case would be high. Is this when the rings are not seated properly when the engine is cold? Lots of compression makes oil blow by past the rings?

How about a high oil level and the oil is getting pulled up the oil separator into the intake?

Is there any place oil can leak into the intake manifold?