Leaded fuel was 95ron. You need to run premium unleaded to maintain your
current tune.
If you want to run 91ron unleaded? You'll have to tune for it.
wrote in message
>I have recently purchased a zl 86 ford fairlane.
>
> It is costing me a fortune to fill with octane 98.
>
> Someone told me it won't hurt the engine to fill with regular unleaded
> and only fill with octane 98 once a month? any suggestions?
>
> thanks,
>
> Gary Brassington
>
>> Stay informed about: 86 zl ford fairlane which fuel?