depends on the year!!! all the newer models EXCEPT for the M's need Synth 5w-30. it must be synthetic!!!
synthetic oil
5w-30 full synthetic
for most cars driven in average weather you us 10-40 grade oil. ... What kind of oil do you put in 1996 BMW 328i? How many liters of engine oil has BMW? ...
For BMW 323i. the company recommends to use only synthetic 5w30 or 5w40 !
use BMW Synthetic 5W-30 oil or Mobil 1 Synthetic 0w-40 oil
I would use 10/40 synthetic in winter and 20/50 synthetic in summer .You should get 7000 to 10000 miles before your next oil change.
50w-30
Use synthetic, change it and the filter every 5000mi. I have over 220,000 miles on mine by following that rule.
use full synthetic or you can 10w30 for winters and10w40 or 20w50 for warmer weather's
DUE TO MY RESEARCH, I FOUND OUT ALL BMW SHOULD USE: Genuine BMW High Performance Full Synthetic Motor Oil, 5W-30
93
15w-40 Castrol non-synthetic is what BMW uses in that model year vehicle from the factory. If you want to use synthetic, Mobil 1 0w-40 is the compatible one.