Quote:
Originally Posted by legion
It's almost certainly a worn part that seals better once warmed up. Piston rings, etc. Worst case, it could be a crack in a cylinder wall.
My guess is that it won't be cured without taking apart the engine. If you want to keep the vehicle, it might save you time/money to find a replacement engine rather than try to diagnose/fix what is already there.
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I'm going to guess valve stem seals/guides.