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Tcoat... I got thinking some more. Another possible explanation is that you drive a LOT. That's good for a car. Few people put on the miles you do. 400K kilometers over 5-8 years is a lot different than, say, 200k miles over 30 years. Up until last year, my cars were made in 1981, 1988, 1993, and 1999. The '93 is gone now, as is the '99. The '81 Rabbit is off the road waiting for strut tower reconstruction, and the '88 560SL is about to go back on the road after sitting for seven months (and a grueling day in the garage yesterday). Those two get maybe 5000 miles a year, my main car (now the FR-S) gets about 15k a year, and my wife's SUV gets about 8K (all miles). Given the sporadic use (especially compared to your driving schedule), frequent short trips, and very infrequent long road trips for anything other than the FR-S (previously, the '93 325i), the 3000 mile oil change intervals make an increasing amount of sense. Your frequent long hauls probably contribute a great deal to your ability to stretch your oil change intervals.
Just thinkin' out loud..
Barry
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