With syntec power technology. Maintained maximum horsepower 30% longer than castrol syntec (5W-30's tested, based on average performance in extreme power tests vs. prior Castrol syntec). Formerly Castrol Syntec. American Petroleum Institute certified for gasoline engines. It's more than just oil. It's liquid engineering. Castrol Edge with syntec power technology delivers: an advanced proprietary technology that neutralizes corrosive particles, preventing them from grouping together and forming power-robbing deposits; maximum performance 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 Edge with syntec power technology exceeds the world's toughest industry standards: ILSAC GF-5, API service SN/SM/SL, Chrysler MS 6395, meets GM 6094M performance, ACEA: A1/B1, A5/B5. Castrol Edge with syntec power technology is compatible with all conventional and synthetic oils. As the technology leader, Castrol continually improves performance through product innovation. Made in the USA from domestic and imported components.