I plan to have my oil changed at 5,000 miles and at 6 months just as the manual says. My dealer carries Mobil 1 5/20. My last new car has over 300,000 miles. I have religously have changed the oil every 5,000 miles for 19 years. It now uses 1/2 gt. between changes. My mechanic has mentioned after he replace a leaky head casket, 100,000 ago that the heads and valves were in good shape. I guess the life of a engine is more luck than anything else.

Andy