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yes. when i purchased the car that was the oil that was used by the previous owner. I then being new to BMW, M and higher performance cars, thought a 10k interval was fine, i mean the dealer thinks so! After seeing the report come back I started to trickle my service intervals to lower mileages not only to see how far the oil would go but also to see where the least wear is. so far the next step is going to be at 3k miles. it would have been a more controlled test with all the same oil weights, but i figured 2 variables is ok. all with similar daily driven characteristics.
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