I have an oil leak on my recently rebuilt 1990 258 I6. Oil is leaking from the back of the oil pan. I replaced the oil pan gasket using a Fel-Pro cork set and it leaked around the rear main and down the passanger side above the starter. I did the job again and had the same results (I am using permatex blue silicone). I did the job a third time and used the 1 piece gasket from the dealer and replaced the rear main seal with a double lip Fel-Pro. Now the pan only leaks around rear main. Oil builds around the back of the pan and then oil drips down from the lip in the pan between the pan and the trans dustshield. I have since resealed the valve cover and checked the connections for my oil pressure and oil filter each seem dry.
How do you tell if the oil is from the rear main or pan gasket?
Has anyone else had this problem? If so how did you fix this?
I have replaced many oil pan gaskets and I have never had this problem.