Oil Change = Engine Failure ???

[crios]

I do believe there is a correlation...drag race cars get their oil changed after each run...this isn’t just for performance.

Oil breaks down with mileage. I change mine every 5K, easy to remember and track via the odometer.

[Boxtaboy]

I know someone with a 97 Boxster who does oil changes at 15k intervals and has over 150K+ miles on his original engine. I personally stick to a 10K interval, just to be safe. I think 3 or 4k mile intervals for 9 qts of M1 is a bit overkill.