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Originally Posted by Paul
One thing I think that is overlooked in these discussions is the fact that our cars hold twice as much oil as US cars that recommend 5000 to 7500 mile oil changes for normal service.
Our motors are smaller than V8s, run cleaner, and have twice as much oil, so the additives last longer.
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Yes, the sump is bigger and that does make a difference. I question why you think our motors run "cleaner"!!!. Why do you say that?
My BMW has a 7 qt sump and the mileage minder never exceeds 11K miles or so.
I am still doubting 20K and moreover, why would you risk premature wear to prove the factory correct?