Redex 10W-40 Part Synthetic Motor Engine Oil is a high quality oil suitable for both petrol and diesel vehicles, including those with fuel injected, multivalved and turbo charged engines. This engine oil is recommended for applications requiring: API SL CF; ACEA A3/B3. Part synthetic oils help to prolong the life of your engine and allow you to drive for longer between oil changes. Always refer to your manufacturer guidelines to choose your oil, or use our Oil Finder lookup.