
Originally Posted by
BMWCurves
I would wager that the 330xi and M3 might have a slightly different subframe, but across 330i transmissions they would have the same subframe. Someone else with more knowledge can confirm.
How cold is it going to get where you live? I think 0W-40 oil will be better suited to colder climates because the oil will be less viscous than 5W-30 when you first start the car allowing the oil to circulate and lubricate the essential motor components more quickly. On the other end of the spectrum, 0W-40 will be slightly more viscous at normal operating temperatures than 5W-30 oil (the "30" part of that oil) but that shouldn't matter for our engines, people use both those oils with no issues as far as I know. Next oil change I'm moving from BMW's 5W-30 to Mobil's 0W-40.