I have a 91 350 sdl that I bought from a guy about 2 years ago. I have never driven the car I think it has the head gasket oil passage problem. I have started the car once to move it 4 ft. and after shut down I get oil spewing out the tail pipe. Has Mercedes perfected the head gasket to replace it or could it be stretched head bolts. I have never seen a real good explanation of why this happens. The car has 190,000 miles on it and is in very good condition other than this problem. anyone have any info?

Thanks