Castrol® GTX® is a premium conventional motor oil that’s been helping to extend engine life since 1968. Its Double-Action formula clears sludge and prevents new sludge formation.
Castrol GTX 3X PROTECT formula is a premium conventional motor oil that was first developed in 1955 and has since evolved to address the three main causes of engine sludge: heat, contaminants, and short trips. Castrol GTX helps clean away existing sludge and creates a protective barrier to prevent future power-robbing deposits from forming, keeping engines cleaner for longer—up to 45% cleaner than industry standards.* Helping extend the life of your engine.
* When tested in engines with a high level of sludge
**As measured in the API SP Seq. VH Sludge test vs API SP limits
Castrol GTX Classic is a high-performance engine oil for push-rod, flat tappet engines and performance cam applications. Its specially formulated for classic/collector cars, muscle cars, hot rods and race cars. Its high zinc and phosphorus content helps prevent premature aging, wear and metal fatigue on engines with high tension valve springs or performance modifications that create high contact pressure and extreme internal temperatures.