Did your Mechanic preform a preasure check through the radiator. By putting a dye in the radiator you can check if you have a blown head gasket or other problems. The one oil that I had problems with was Penzoil as it would leave a milky residue on the valve cover cap. I switched oil and it went away.If it was me and it continued I would pull the head and have it Magna Fulxed a new gasket after having the head milled and I like to use Copper Cote on my gaskets and have never had any trouble with leaks.
62Blue
Don

Last edited by Don G.; 05/23/2010 9:13 PM.

62Blue
62Chevy in progress
You've never been lost until you've been lost at Mach3" Paul F Crichmore (Test Pilot)