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Gulf Western 15W-40 Extreme Diesel Engine Oil is a heavy duty high performing oil formulated and designed to meet API CI-4/SL specifications. This oil is designed to work well under Australias harsh conditions whilst being OEM Approved by Cummins, Volvo, Mack and Renault. This oil has the latest in oil additive technology and fuel efficiency standards. It provides excellent engine protection and offers advanced protection against cold start wear, oxidation while providing superior thermal stability.