Good to hear , Good luck with that but Castrol Titanium w5 30 is really the best for bmw engines cleans them great, flows great , Bmw engine are hot running engines they run best HOT, Castrol just flows better in Bmws ............I had a 4.6is and now I am on a 4.8is the 4.6is died because of bad mechanics killed my engine. and oil flow was key to killing it.........................my 4.8is I am paranode about it , I been using the Castrol runs great the big V8 burn next to nothing about 1/2 quart every 4000 miles.
Good luck.

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2006 4.8IS
65K MILES
PURCHASED 7/13