Unleaded should be fine and cause no issues, 'busman'. I think back in the day Volvo advised fitting a second H.G. on the higher compression motors to lower the C.R., but you should be OK with the B21A engine. Although not essential, I think that I would use E5 where available, rather than E10, not so much for the higher octane but more for the lower ethanol. It's a tad more expensive, but you should recover that with increased MPG.
Regards, John.
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Last edited by john.wigley; Apr 1st, 2024 at 21:45.
Reason: Typo
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