CM871 Engine cycle...

[KW660_16]

Another thing. Oil is cheap. Why take a risk and split hairs over when you change oil when an engine rebuild costs $30-40+ thousand dollars. over the life of 1 Million miles OR 10 years you save about $10,000 on oil. BUT you increase your risk of long term expensive damage on your engine significantly when your oil is not in ship shape. Why gamble $40,000 just to save $10,000. The math doesn't add up.