Castrol GTX is one of the world’s most trusted engine oils. It’s more than just oil. It’s liquid engineering that protects against problems, like sludge that your engine faces every day. Severe driving conditions such as heavy traffic, poor fuel quality, harsh weather conditions and exceeding oil change intervals can all cause the build-up of a thick, tar-like substance called sludge. You can’t see this sludge build-up but it can damage your engine’s performance and cause premature engine failure. Help extend the life of your engine with Castrol GTX. Provides superior protection against engine sludge (vs API SN limits) Advanced protection against viscosity and thermal breakdown Premium quality base oils and anti-wear additives that help extend the life of your engine Helps minimise oil consumption. Specification/Technical Data: API SN/CF.