Originally Posted by BMW TECH 1
Mobile 1 is the worst oil on the market . It is not a true synthetic oil .Quaker state euro sythetic oil is a true synthetic oil 5w30 . I have been a BMW tech for 25 years and trust me stay away from Mobile oil . The next best thing would be Lubromoly synthetic .
what the hell are you talking about? please tell me where you heard Mobil1 is not a true synthetic oil.
if ANYTHING, Mobil1 is the only domestic brand that IS a true synthetic. Castrol Syntec was proven to be a bunch of bullshit "synthetically" refined mineral oil. and that was in a lawsuit BY MOBIL1!
Liqui-Moly is an excellent synthetic German oil. only other true synthetic oils that wont cost you $20/litre or more are Amsoil, Royal Purple, ELF, and Motul.
I'm currently running 10W30 Mobil1 in my M44 engine, and its great. I already have a 5L jug of Liqui-Moly 5W40 lined up for my next oil change. I understand M44's are much better suited to 5W40, and the only stuff I'd put in from now on is Liqui-Moly, Amsoil, or Motul.
to answer your question: stay away from "extended life" oils. even synthetic oil should be changed often. although it maintains its viscosity much longer than mineral oil, it still gets dirty from metal particles, and your filter still needs to be changed. i change every 3,500 KM on synthetic.