I noticed that my 2002 M3 Service Guide lists that the cabin microfilter is to be replaced at each oil & filter service. However, I see that the cabin filter was replaced only once (at 3 years) during a no-cost service visit for a low annual milege oil service. The micofilter was not replaced at the 1 year and 2 year low annual mileage oil services. I now have 18,000 miles on it I still show 7200 miles to Inspection I, which will probably be sometime in 2010. I took the M3 in for an annual $100 oil service at the dealer the other day and again the cabin microfilter was not changed. Has BMW changed their service recommendations foro the cabin microfilter? Wondering what other E46 M3 owners have been doing regarding the frequencey of replacement of the cabin microfilter and isn't there another service display for "Oil change" that comes up separately from the "Inspection" display. I've had the oil changed annually (never more than 2000 miles) and have never seen an "Oil Change Light" even though I asked the dealer not to reset the oil service counter. Wonder what's going on here? Also noticed tonight that Level I and II both require an E46 M3 check and adjustment of the valves, but my two differenent dealers (and others here on this and other forums) state that valve adjustments are normally pushed out to Level II if the engine tappets sound good and the car runs fine? Weird. BTW, what is the typical mileage needed for the E46 M3 Oil Service Light to come on? .... I Can't find a mileage recommendation listed in my owners manual.