Does anybody use the stuff? I know it is a bit pricey, but I am deciding on what type of oil to use on my wife's diesel BMW. I started another thread asking questions about pentosin oil. Through my research I have come across Motul x-clean which also gets the BMW LL04 rating. The weight I am interested in is a 5W 40. Does anyone have experience with this brand of oil? Is it a better oil than most? I try doing a search and I found a few positive things but nothing specific for BMWs