BMW brand oil?

[Paul in NZ]

and the lower the first number the easier it will pump and pour when cold.So a oil tht pumps and pours easier when cold will give protection when your engine is first started.So thats the first thing about synthetics.The second thing is they do not break down like dino and because of the capacity I have bsolutely no qualms about running castrol synthetic for the full srvice interval.And the BMW dealer here would put synthetic into the 535.Its a no brainer.Unless your engine already burns lots of oil or has BAD leaks synthetic is the only way to go

[Airborne001]

Well I don't have a single leak, and if I understood what I read correctly, I should put 5 quarts of group 4 and one of group 5 in order to condition my seals for full syn?

[markus]

im thinking about running the 5w-40 or 50 syntec if i take a ride to wal-mart tommorow.