silverhook 10 W/40 semi-synthetic petrol/diesel engine oil SL/CH-4 is a super multi-grade, the "Excel started at high and low temperatures even during cold extremities, the highest level of protection. Excel is based on the latest developments in additive technology formulated & with a blend of the whole synthetic base stocks and first quality solvent refined mineral oils, a high performance engine oil with improved properties of semi-synthetic technology. Excel is the high API SL/ch-4 specification. Suitable for conventional, multi-valve and turbocharger petrol & turbo diesel.