Lucas Oil semi-synthetic racing engine oils provide a best of both worlds solution as they offer superior engine protection at an affordable price. Designed for use in race engines these oils contain high levels of Zinc for extreme wear protection under high loads.Excellent levels of protection at an affordable priceHigh levels of zinc additive for superior wear protectionCompatible with all fuels including E85 and MethanolSemi-synthetic racing oil offers higher levels of lubricity which can improve engine power through reduced friction. They also reduce cavitation which improves oil pump efficiency and keeps oil pressure higher.Lucas Oil semi-synthetic racing oils are not suitable for vehicles fitted with catalytic converters.1 Quart (0.946 litre) or 5 Quart (4.73 litre) bottles.10W40 Semi Synthetic Racing Oil Technical Data Sheet20W50 Semi Synthetic Racing Oil Technical Data Sheet