Plugs tell a story of what is going on in your combustion chamber. If they are fouling, it is because there is some type of combustion abnormality. External oil leaks cannot make a plug foul.

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Ali Al-Chalabi

2001 CLK55
1999 Dodge Ram 2500 Cummins Diesel
2002 Harley-Davidson Fatboy
Merlin Extralight w/ Campy Record