cylinders 1 & 3 have oil leaking onto them. What causes this & how do I fix?

Question

2003 Nissan Altima starting running hard, AutoZone pulled code p0300. I pulled the plugs and found oil in cylinders 1 & 3. There was no smoke, no loss of coolant, but the oil does get low about every month. What could be the cause and the fix? Thanks for any response.

Answer 1

Oil fouling in the cylinders are caused by several things, bad valve guides and seals, worn or broken rings, a bad head gasket or a crack in the block or head. You must do a dry/wet compression test and leak down test in each cylinder and a coolant system pressure test to determine the source of the leak.

Comments

I left out checking the crankcase vent system.