BMW oil vs other oils
Okay, I've read many forums about which oil I should use or which one are the best for my car(2000 323ci), but I've never gotten a straight answer from any of them. So, my question is: Which oil would be best for my car, it's says: use BMW 5w30 high performance Oil only on my engine. But I've read people using mobil 1 ow40? Or castrol edge 5w30? Which oil and oil weight would be the best for my car beside the BMW oil? Or is that the best oil to use on my car?