Hi guys, i am a newbie here. few days ago managed to get E39 2001 with M54B25, the condition of the car is very good. Yesterday went to workshop to change engine oil. The foreman suggested to put Petronas Synthetic 15W50, and i agreed. I ve read some articles and forums, lots of arguments there regarding which oil to put. Most of them say that 5w30 or 5w40 (LL-01 approved) is the best oil for M54 engine. In my case Petronas synthium 15w50 is not LL-01 approved. Any opinions,suggestions? Should i change it or wait until next oil change?