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02-27-2009, 09:14 AM
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#11 |
 
Drives: Scion FRS RS2, ‘21 Crosstrek Join Date: Oct 2008
Location: Chatham, Ontario, Canada
Posts: 1,729
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I would suggest that if your engine "rattles" on regular octane fuel then it has a problem that your selling dealer should have repaired (warranty?).
I'm no mechanic but can't imagine how different fuel could "fix" a valvetrain noise. But a KNOCK/pre-ignition yes. Improper ignition timing may cause pre-ignition which might be remedied by higher octane. My question to the dealer would have been "why is the engine rattling?".
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