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E39 w. knock sensor adapts to a range of octances. (archive)
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Posted by ..see owner's manual. Paul on January 08, 2001 at 11:42:55:

In Reply to: Gas is Gas but use the Octane speced for car posted by Charlie on January 07, 2001 at 23:15:46:


Gas is gas. Brand does not matter. It is traded back and forth at all levels of production and distribution by all players. I live in Boston and regularly see Mobil tankers leaving Global terminals.

Per local Boston Globe article, variations in octane level vary the combustion point given a certain pressure. The higher the octane, the higher the compression required. (If I remember the article correctly.) If you use low octane when high octane is specified, premature ignition will occur. So, use what the mfg recomends, no more, no less.




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