Synthetic oil only
The type of oil for a 1997, BMW 540-I is a synthetic 5w40 blend.
Hash oil
The type of oil used for a 1996 BMW 318i is 5W 40. This oil can be purchased at any auto parts store such as AutoZone or NAPA.
Castrol Full Synthetic 5w30 is what BMW recommends.
Castrol Full Synthetic 5w30 is what BMW recommends
10/40
10W30 oil is fine for that car. I also have a 1991 BMW 318i and my mechanic who worked for BMW for 20years says to as well.
5 / 40 fully synthetic oil
the 328i BMW if it is the M52 engine should be using 5w30 synthetic oil, same as the 2.8 Z3
5w-30
Full synthetic 5/30
5w-30