Browse over 9,000 car reviews


I USE regular unleaded petrol in my 1974 MGB with an additive, but I've been told I could use 98-octane fuel without an additive. Is this correct?

THE higher-octane fuel will make the B sing a little more, but I would still use an additive. The purpose of the additive is to cover the loss of lead in the fuel and protect the valves from recession.

Disclaimer: You acknowledge and agree that all answers are provided as a general guide only and should not be relied upon as bespoke advice. Carsguide is not liable for the accuracy of any information provided in the answers.


Have a new question for the CarsGuide team?
More than 9,000 questions asked and answered.
Complete guide to MG B 1972
Complete guide to MG B 1972 CarsGuide Logo
Reviews, price, specs and more