Unlock the power. In torture Castrol Syntec maintained maximum horsepower longer than the leading convention 5W-30. American Petroleum Institute certified. For gasoline engines. Helps maintain maximum horsepower. It's more than just oil. It's liquid engineering. It takes more than a conventional oil to provide far superior protection and performance for your vehicle. So Castrol created Syntec - the result of over 100 years of cutting edge technical advancement and record-breaking performance. Castrol Syntec's unique and proprietary formula reduces volatility and provides superior protection for critical engine parts allowing your car to function optimally at maximum power. Unlock the Power with Castrol Syntec. Castrol Syntec delivers: An advanced additive package that neutralizes corrosive particles, preventing them from grouping together and forming power-robbing sludge. Stability and endurance under extreme conditions (heat, load, speed) that can cause conventional oils to break down. Superior engine protection that outperforms leading conventional and synthetic blend oils, passing severe industry torture tests. Castrol Syntec exceeds the world's toughest industry protection standards. API Service SM/SL/SJ/CF; ACEA: AL/BL, A5/B5; GM6094M; Ford WSS-M2C929-A; Meets all requirements of GF-4/GF-3/GF-2. Syntec is compatible with all conventional and synthetic oils. As the technology leader, Castrol continually improves performance through product innovation. This may result in color/odor variations from time to time. Made in the USA from domestic and imported components.