GB UNIMOT® SYNTH HD 5W-40 is a fully synthetic fuel-efficient heavy-duty diesel engine oil formulated using the highest quality synthetic base oils and enhanced additive systems, for use in heavy-duty diesel engines, in severe on and off-highway applications. Based on low SAPS technology (sulphated ash, phosphorus and sulphur), this premium engine oil may be used in both Euro V and Euro VI engines as well as Tier 4 non-road diesel engines where an oil of this quality is specified.