If your engine number has L as its last digit, and you are certain that
the engine has not been modified, 87 octane is fine.
If your engine number has H as its last digit, 89 octane is a safer
choice.
With ignition max advance at 32 BTDC and in good tune, if engine
knocks/pinks when you are climbing a hill at 2500 rpm, try a higher-octane
blend.
My engine, 9.5/1 compression, likes 89.
Bob
> On Sep 20, 2023, at 11:32 AM, i erbs <eyera3000@gmail.com> wrote:
>
> I just got my B running for the first time and have a newbie question. I have
> looked online and got confusing answers.
> What grade petrol do I use? Must I use premium grade? Can I use regular?
> Thanks.
>
> Ira Erbs
> Milwaukie, OR
> 1959 Austin Healey 100-6
> 1967 MGB Roadster
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