The valve cover gasket was leaking. Figured I would take these pictures for your viewing enjoyment. The engine has 150,000 miles. I bought the car at 100,000 miles, previously owned by a mechanic who's wife put 100,000 miles on the car in 18 months (regional sales manager) oil change interval unknown. Have used 10w-30 HDEO (SN rated) in the spring/summer/fall and 0w-30 in the winter. I don't change based on miles, instead I change on season. The summer HDEO may run 10,000 miles or more and the winter 0w-30 usually gets about 8,000 miles.