About Castrol RX
Castrol RX is there to cater for every diesel truck engine on the road. With an extended family that consists of fully synthetic engine oils with outstanding anti-wear and protection additives, Castrol have crafted a range of truck oils that are tried and trusted by some of the world's leading commercial vehicle manufacturers, drivers and mechanics. With a combination of the finest oils and the latest technological advancements, it's no wonder that so many people have trusted in Castrol to deliver the most modern protection for their truck engine for over 30 years.
Oils like Castrol RX Super 15W40 use Castrol's System5 technology to focus on 5 key areas of engine oil performance, maximising fuel consumption, oil consumption, oil shange interval, component life and power. This is combined with Castrol's incredible Durashield booster technology that reduces engine wear, corrosion and the formation of deposits by up to 40%, significantly increasing engine protection in 3 vital areas.