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Hi deheld, My Audi A6 also recommends extended service intervals just like my B200 but I don't trust them. The really best way to know the condition of your oil(and your motor) is to keep a sample of the old oil at changout time and take it to a lab that can accurately evaluate the minerals and deposits in the old oil. These labs are easily available in North America and I suspect the same for Europe and the cost of such a test is very low. If you test your oil after 50,000 kms, you might not be happy with what they show you is in that old oil. I find the B200 OE filter with it's single fine membrane lacking, so I change it more often than recommended along with the oil. It's a lot cheaper than rebuilding the motor. Cheers, Derek
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