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Re: '81 320i - Recomended gasoline ocane levels (archive)
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Posted by Jeff Cuppy on October 02, 2000 at 15:56:42:

In Reply to: Re: '81 320i - Recomended gasoline ocane levels posted by Sean on October 02, 2000 at 12:41:34:

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.

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