A7 OOH Posted March 31, 2021 Share Posted March 31, 2021 I am running a X/Flow with an unleaded head (Recent Acquisition)I assume like my previous classics I should be using an additive such as Castrol Lead Substitute. If I use a premium fuel such as V Power or BP ultimate can I forget using an Octane boost additive or do I need to use a premium or will standard unleaded work Link to comment Share on other sites More sharing options...
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