Castrol Classic GP50 was developed for racing, making it particularly suitable for high performance classic cars and motorcycles. This oil was widely used in vehicles pre-war and during the 1940s was also used in aero engines.
 
Its excellent high temperature performance and film strength makes it a popular oil for larger engines that are hard on their lubricants, and it remains popular in the classic racing world today.
 
Castrol Classic GP50 is a premium SAE50 monograde oil.  Formulated with high quality mineral oils, plus carefully selected additives, it is ideally suited to older technology and classic car and motorcycle engines.
 
For pre-1950 performance cars and pre-1970 motorcycles
Traditional low detergent SAE 50 monograde engine oil
Offers excellent high temperature performance
Excellent noise suppression
Very high level of engine wear protection