Castrol GTX C3 Engine Oil 5W30 20 LitreSPECIFICATIONS INDUSTRY STANDARDS ACEA C3 API SN CF GM dexos2* MB Approval 229. 31 229. 51 * GM dexos2TM: supersedes GM LL B 025 and GM LL A 025 : D20789IB082 Castrol GTX is one of the world's most trusted engine oils, helping to extend the life of engines since it was first introduced in 1968. It's more than just oil. It's liquid engineering that protects against problems, like sludge, that your engine faces every day.