Kenworth factory-fill synthetic lubricants are now available through the Kenworth dealer network. The Kenworth synthetic lubricants include SAE 50 synthetic manual transmission fluid, 75W-90 synthetic axle lubricants and the optional 80W-140 synthetic axle lubricant. All three products meet the ArvinMeritor and Eaton Roadranger® extended 750,000-mile warranty and 500,000-mile extended lubricant drain interval requirements.