The complete automotive resource for buyers, sellers, and owners like you.
Car, Truck and SUV Forums at Roadfly
+ Bentley Forums
+ BMW Forums
+ Cadillac Forums
+ Chevrolet Forums
+ Ferrari Forums
+ Jaguar Forums
+ Lamborghini Forums
+ Lotus Forums
+ Mercedes-Benz Forums
+ Maserati Forums
+ MINI Forums
+ Porsche Forums
+ General Discussion
+ Marketplace Forums
Re: '81 320i - Recomended gasoline ocane levels (archive)
[ Follow Ups ] [ 3-series (E21) Message Board ] [ Msg. Board FAQ ]
Posted by Austin on October 03, 2000 at 20:36:22:

In Reply to: Re: '81 320i - Recomended gasoline ocane levels posted by Jeff Cuppy on October 02, 2000 at 15:56:42:

I concur.
The manual calls for 91 octane.
Super usually has a detergent additive to keep valves clean too. I've always run 92 in all my cars, unless at the track, then it's Unocal 96.



A higher octane gas will have less of a tendency to pre-ignite which in turn causes valve pinging and engine knock. Some cars have preignition retarders in the engine (not so in an 81 BMW) The engine does run cleaner with a higher octane. So if you have valve ping or engine knock spend the extra money. I always feel better putting super unleaded in.




Follow Ups:


[ Follow Ups ] [ 3-series (E21) Message Board ] [ Msg. Board FAQ ]
Questions, comments, or problems, please visit the Roadfly help desk.
Roadfly.com Logo © 1997 - 2009 Jump Internet Inc. All rights reserved.