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31/10/2025 6:58 am
Topic starter
I have a 2016 Yukon XL 5.3 with oily spark plugs, I know some vehicle have spark plug gaskets, but i can't find if this vehicle has them or not. Is it enough to replace the valve cover gasket and this could possibly fix this?
2 Answers
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31/10/2025 5:47 pm
The 5.3 doesn’t have plug gaskets. You probably have a leaking valve cover that is seeping down
1
31/10/2025 7:07 am
A good gasket set also comes with spark plug tube gaskets. Generally, if the plugs are all wet from top to bottom of the oil, those gaskets are bad
