TRIAX Fleet Supreme synthetic diesel engine oils are the ultimate choice for maximizing engine performance. These are state-of-the-art engine oils built with performance as a priority while maintaining complete OEM spec compliance . TRIAX Fleet Supreme oils are fully formulated products, designed to both API CK-4 compliant and to meet and exceed both the API CK-4 specification and all related OEM specifications in the CK-4 family, such as Volvo, Cummins, Detroit Diesel, Mercedes Benz and Ford fitted with exhaust after-treatment devices such as DPF and SCR.