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I have a 1985 Mitsubishi L200 Sport 2000 Ute - Petrol. On Petrol flap it states Premium Grade - what should I be using...91, 95 or 98 Octane?
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If the petrol flap states premium then 95 octane will be fine. The lower 91 octane is the one to avoid probably due a high engine compression ratio which cannot tolerate this fuel for long periods.
The higher 98 octane can also be added however, why pay more for your fuel than you need to with no real benefits.