CK-4 fully synthetic heavy-duty diesel engine oil is suitable for all heavy-duty diesel vehicles, with excellent high-temperature shear (HTHS) viscosity, which can more accurately help the engine perform more finely, while maximizing the fuel economy of the vehicle. In order to meet the demand for long oil change intervals for heavy-duty engines during long-distance transportation, Guinness Lubricants has developed CK-4 long oil change mileage technology, which uses a fully synthetic base oil and long-term anti-wear factors to form an advanced formula. It has multiple long-term protection technologies, which can extend the oil service mileage and display excellent anti-wear performance. Under long mileage oil change cycles, Guinness CK-4 fully synthetic heavy-duty diesel engine oil can also exhibit excellent detergency and dispersion performance, effectively suppressing the generation of carbon deposits and oil sludge, dispersing soot, and keeping the engine as new as ever.