Schaeffer Supreme 7000 Synthetic Plus is a heavy-duty diesel engine oil designed with exceptional soot handling capabilities, oxidation resistance and extended wear protection. Schaeffer's 15W-40 motor oil is formulated to withstand a heat range of up to 250 degrees more than commercial grade oils and delivers up to 5% fuel savings. Supreme 7000 reduces friction and protects against the damaging effects of metal-to-metal contact. For an exceptionally clean engine that is free from oil residue and sludge, use Schaeffer Supreme 7000!