GB TURBO SXC4 5W-30 is a fully synthetic passenger car oil formulated using the highest quality synthetic base oils and enhanced additive systems, for use in both petrol and diesel engines. It has been specifically engineered for use in the latest generation Renault diesel engines, where a low SAPS product of this quality is required (sulphated ash, phosphorus and sulphur) and has been developed to maximise the life of the exhaust after-treatment systems. Because of its lower viscosity, it is recognised as a fuel-efficient lubricant which also provides better cold starting and less wear on engines, starter motors and batteries.