Castrol Classic XL 30 High Quality Monograde Engine Oil SAE30 Pre 1950 1 Litre. This oil is designed for 4-stroke engines and is suitable for classic cars and motorcycles. It offers excellent cold temperature starting, improved oil pressure, and good anti-wear performance. The oil is mineral-based and has an SAE 30 viscosity. It is suitable for manual transmissions and is part of the Classic segment. All products are shipped from the UK. We offer a 60-day returns policy and a no-leak guarantee.