Originally Posted By: Gokhan
Originally Posted By: OVERKILL
Originally Posted By: Gokhan
Bad valve-stem oil seals seeping oil into the combustion chamber, as evidenced by oil-soaked threads and oil-ash deposits.
The oil on the threads may simply be from a leaking valve cover gasket though. There's definitely oil deposits on the plug itself on the one furthest to the right, which I already made note of.
If it's oil on the threads, it's probably not the gasket. Yes, definitely the plug on the right shows excessive oil consumption as indicated by quite a bit of ash deposits.
Middle one that has the oil on the threads seems like its burning pretty clean does it not?
From my experience any oil getting into the combustion chamber is burnt and deposited as ash, while external leaks (like valve cover) will have the threads a bit oily.
Definitely the farthest right is burning oil.