Just found this stuff, what do you think? is it any use ?? 5W40 Fully Synthetic Motor Oil is suitable for use in the latest high performance petrol and diesel engines requiring low viscosity oil, including turbo charged petrol and light diesel vehicles. Gives maximum performance for cold start to high temperature driving, and outstanding engine cleanliness and protection. This motor oil is suitable for vehicles with catalytic converters. Meets or exceeds the requirements of the following specification: API SL/CF ACEA A3/B3. 5l for Â£20 at ASDA!!!!