I have a 72' Mercedes 220/8. When it runs it smokes very badly, it smokes out the tail pipe and out the valve cover. I was wondering how would I know if it is the piston rings or the valve guide seals. The smoke is more of a grey rather than a blue.
sounds more like a top end issue, check engine vents and ensure oil is not leaking onto the header this will be drawn into the exaust then you will see lots of smoke from the rear, it might just be as simple as that[:)]