@ 130K on 2003 3.0 ... have always used 5-30 BMW Full Synthetic API SL. I would guess we use a quart every 4-6K miles. The SL-API has the right amount of ZDDP and I am unsure of Mobil 1 SM/SN so I didn't use it. Theoretically SM/SN should be fine (easier on the Cat Conv but with a little less lubricity). I have not been pleased with Mobile 1 0-20 in a Honda Civic Hybrid (though I am still in the early testing stages).