Absolutely true...if excessive enough gives you the tell-tell bluish smoke out the exhaust pipe (worn rings)
Yes, I was meaning the oil in the crankcase below the piston on the cylinder wall that could be opposed by high crankcase pressure to return to the pan and be subjected to the high volitility (burn-off) of elevated cylinder temps due to malfunctioning EGR. Sorry, I should have stated it better than I did.