Castrol GTX is one of the world’s most trusted engine oils. The modern world creates difficult challenges for engines. Poor fuel quality, heat and frequent short trips can all lead to sludge that potentially shortens engine life. Sludge is a sticky deposit that can block your engine’s vital oilways and if untreated it can rob an engine of power and, ultimately, its life. Castrol GTX with 3X CLEAN formula works to Catch, Control and Clean dirt from engine oilways, keeping your engine cleaner for longer and helping to extend engine life. Castrol GTX also protects against new sludge formation better than tough industry standards*. Help extend the life of your engine with Castrol GTX. * vs API SP Limits