Liqui Moly Leichtlauf High Tech 5W-40 oil is made of synthetic oils. This means it won’t turn thicker or thin with temperature changes like other engine lubricants. It penetrates the engine better for protection and longevity under stressful driving conditions. Liqui Moly Leichtlauf High Tech 5W-40 was engineered from pure German ingenuity. With low-pressure additives for diesel engines as well as some serious cleaning agents, Liqui Moly knows how to cut through emissions. Liqui Moly Leichtlauf High Tech 5W-40 exceeds API certification CEFA, ACEA A3/B4, ILSAC GF2 with increased performance levels that will save you time, money, and hassle of your aftermarket oil changes.