Classic ST90 is a gear oil formulated with high quality mineral oils. It contains anti-oxidation and anti-wear additives to ensure gear teeth are protected against wear in gearboxes and axles. Suitable for most types of gears including helical, spur, bevel and worm, but not to be used with hypoid gears. The additive system is suitable for sensitive (yellow) metals, such as brass and bronze.
Monograde SAE90 gear oil
For gearboxes and differentials where a non low EP gear oil specified
For straight cut gears
Use where ‘Castrol Swanshot’ is specified
API GL-3
Free delivery on orders over £50. See Delivery & Returns page for further details
Castrol Classic Oils are specially formulated in the style of the original products. Using traditional mineral oil and a low detergent formulation, Castrol Classic Oils are the right choice for your cherished classic or vintage vehicle.
Older engines have very different requirements to modern engines. With larger oil galleries and a greater reliance on splash and cling properties, seals made from traditional materials, and the risk of carbon gum and varnish, you need to be sure that your oil will perform as the vehicle manufacturer originally intended.
With the most appropriate and carefully balanced additive technology to provide the best protection and performance for classic engines, Castrol Classic Oils are your premium lubricant.