I've been using Mobil1 5W-30 synthetic on both of the bimmers. I switched to Mobil1 0W-30 since I cane get them at Walmart for $25/5Qt Jug. I see a drop of oil over night, which wasn't there before, on the E53. I'll switch back to 5W-30.

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00 E39 DINAN S1 //M5 (82k miles)
06 E53 DINAN 4.8iS, born 2/18/2006 (126k miles) http://www.xoutpost.com/bmw-sav-foru...s-my-dslr.html
90 Straman Z32 TwinTurbo Convertible, (1 of 44 ever made) 5 speed, 444rwhp/451rwtq
01 360 Novitec Spider F1 (26k miles)