Castrol Classic XL 20W50 SpecificationsCastrol Classic XL 20W50 is a high quality classic multigrade oil formulated from mineral bases and specific additives to meet the requirements of older vehicle engines. This lubricant is suitable for vintage cars and motorbikes used under normal conditions however it is not compatible with engines fitted with catalytic converters.This oil can be used all year round and has special properties that guarantee excellent lubrication and high resistance to ageing. Compliant with API SE/CC standards it is perfectly compatible with the seals and materials used in vintage vehicles. Packaged in 1-litre cans.