Cylinder head gaskets rarely leak oil and not after an oil change. If there was no previous leak, check the old filter for the rubber o-ring gasket. If it's missing, it most likely stuck to the engine and you put the new filter over it. That's called "double-gasketing", and we've all done at some point. The old one is going to blow out and cause a major leak.
If the leak was there before, suspect a leaking valve cover gasket or oil pressure sending unit first. Look for the highest point you see that oil.
Thursday, October 17th, 2013 AT 11:45 PM