Need an opinion ASAP....

[John W]

are you sure about the 89 octane for the M44, i have been putting 91 in it ($2 more a fillup if that ).

Yes. It specifies it in the owner's manual. Should also be a lot on this at 318ti.org.

[christophbmw]

Yes. It specifies it in the owner's manual. Should also be a lot on this at 318ti.org.

it says "premium unleaded", in the manual (it must be dumbed down for americans, cause most of us here dont know the difference between 87 and 91.....just premium, plus and unleaded :rolleyes:). I just told my fiance to put 91 octane in it. :cool:

[nomad]

Cali regular is 87, then 89 and then 91
For the E30 I went down to 89 and have not heard any pinging (piston tops were cleaned on the rebuild) and it seems to run a little smoother than with 91, but I'm sure that's placebo.

For the M44 you have a knock sensor so 87 can be run as the ignition timing will be pulled back to compensate. Mid grade should be fine but if you want to go for 91 then no big deal.