Cadillac Valve Covers I Have An Oil Leak. Can An External Oil Leak Come From A Bad Head Gasket On My 99 Cadillac Catera?

I have an oil leak. Can an external oil leak come from a bad head gasket on my 99 cadillac catera? - cadillac valve covers

I took my Cadillac car dealer with an oil leak, and said it was the tightness of the valve cover and I've been in over $ 1000. It does not fix the leaks. Then I took it back, and then said it was the head gasket and said it would be at $ 3,300.