Just got back from the airport so that delayed my response, I think the last service was a "D" on 4/29/10 which seems like a long time ago although the mileage seems about right, 25K then just turned 34K now. I have a call into my MB service advisor to confirm if that was the latest service. What do you think if it was that long ago, get it done soon or wait for the mileage to trip the dash alert? Thanks, Desert