Our '02 wagon has been fed a diet of M1 0W-40 since new. The service A/B indicator is followed. We typically travel 10-11k miles between services. I have done 1 UOA and the result was excellent; I think I posted it here. I am about to do a 2nd UOA in the next few weeks when the B service is due.

The oil is still fairly clean (darkened, but still translucent) when drained and could have traveled safely another 3- 4k miles per the UOA documentation.

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1998 W210 diesel (wiped out by a texter)
Baum spring compressor "for rent"