question on octine
rexl
08-22-2017, 08:16 PM
deville has been running premium owners manual says unleaded regular. can I change to regular?
Stealthee
08-23-2017, 07:08 AM
Yep. If you've been putting premium in then its been nothing but a waste of money. You only need to run enough octane not to knock. Any more than that is a waste and can actually harm fuel mileage.
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