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Old engines, like a 53 MG, were designed to run on leaded gas. If I remember right it had to do with the valves and or valve seats and without the lead in the fuel it wasnt' good for the valves/seats. When the engine is rebuilt there was an optional upgrade for the valves to a stelite coated valve that negates the need for the lead in the fuel. I don't know why you would only use it during the summer though.