I am actually surprised that many folks are even considering long oil change intervals. I change my oil in all my vehicles at 5000Km (3000Mi) intervals and consider that to be as far as I would want to go. I sure wouldn't want to buy a pristine Benz which had been babied with 10 -15 K oil changes. Frequent Oil changes are your best mechanic and go a long way to making your car go a long way. At $50-75 per change with filter what are we really looking at saving. Just my opinion. Cheers Dan

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It's always something simple
91 300D 603.960 (from japan) 194K
92 Toyota Diesel Landcruiser HDJ81-t 116K
02 Golf TDI new head courtesy of PO
87 300D
97 BMW 525 TDS Wagon 5spd
bunch of Onan and other diesel generators