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OK to put 89 octane in 330?

2560 Views 34 Replies 27 Participants Last post by  Double Vanos
Hey all, the manual says only put premium.. but cmon is it gonna make that big of a deal to put 89 in a 330?? I know in an M3 you would have to... what do you put in yours? Any problems with 89??
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The stunning results of running the lower grade fuel are -22 ft/lbs and almost -19 HP!!!!

You decide.
soheilm3 said:
according to my manual u can. supposdly our cars have an "automatic knock sensor" or somethin like that. ur car will perform "worst" but it will not damage the engine (so it says). i would jus make sure to fill up with the lower grade octane once the tank is as empty as possible, im jus not comfertable with mixing gas.

...decreases fuel economy, increases emissions, causes the engine to run hotter, and reduces the longevity of both the engine itself and the catalytic converter.

Is it really worth it?
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