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- Castrol Classic 50W is a premium monograde oil
- Formulated with high quality mineral oils, plus carefully selected additives, it is ideally suited to older technology and classic motorcycle engines
- Castrol research has found that the specially blended 50W, with the additives included, performs as well or better than a typical 60W oil
- Specifically in high-heat applications like air cooled V-Twins:
- Flathead
- Knucklehead
- Panhead
- Shovelhead
- Ironhead
- Offers excellent high temperature performance and noise suppression, as well as a very high level of engine wear protection
- Sold as 5 liter metal can