PEAK Engine Oil and PEAK Full Synthetic Engine Oil are as tough as the vehicles and environments in which they operate. PEAK Engine Oil and PEAK Full Synthetic Engine Oils are designed to deliver on performance in:Shear down, Viscosity loss and thickening from heavy soot loading and oxidation, Sludge and carbon deposit reduction, Low temperature pumpability enabling faster start-up and reduced engine wear in low temperatures, Emissions control system protection.