Gulf Western SYN-X 4000 5W-30 is a full synthetic, high performance engine oil suitable for use in petrol and light duty diesel engines. SYN-X 4000 is designed to provide increased fuel efficiency while minimising wear on engine internals, particularly common during cold starts and is formulated using the latest in API additive technology. Full synthetic base oils also help to keep your engine internals clean free from sludge and soot while also maintaining engine oil performance for extended oil drain intervals. SYN-X 4000 is suitable for passenger vehicles and light commercials using petrol, LPG and diesel fuels that require API SN or ILSAC GF-5, 5W-30 or 10W-30 specifications. SYN-X 4000 also meets GM Dexos1 manufacture specifications. To find the oil type and viscosity suggested for your vehicle; either add your vehicle to My Garage or check with your manufacturer, vehicle user manual, your local mechanic or head in-store and talk to one of our friendly team.