Rick76, No, the head gasket had not been changed when I bought the Mercedes last year. The issue was still there when I bought the Mercedes. Previous owner claims the valve cover gasket needed to be replaced. When I removed the valve cover, oil was everywhere inside the valve cover. I replaced the valve cover gasket with new seals. I also had to replaced the front fuel injector facing me on the right side (driver's side) and oil was inside as well. The older fuel injector had broken o-ring seal. Will look into the timing cover seal area and check that out as well. Thanks for your comments.