I have 92K miles now. Changed my oil every 3k through 70K ( dealer paid ) since then I change my oil between 7~11K. last time was 11K. once I got the oil out, I looked at it (compared to the new oil, both Mobil 1) and decided there is very little visual difference. This motor should last another 100K no problem. Still running on original plugs and getting 26 MPG on 75 mile commute. So far so good