745058 Spectro Heavy Duty Gear Guard SAE 85W140 Gear Oil 1 US Quart

Spectro Premium Gear Guard SAE 85W140 is an extreme high-pressure gear lubricant formulated to quiet noisy transmissions in Harley-Davidson 4-speed and 5-speed Big Twin models. This multi-viscosity GL5 oil exceeds API classifications GL1 through GL5, providing superior film strength under heavy loads. The additive package is specifically engineered to improve fluid flow to bearings and reduce friction within the drivetrain, resulting in easier shifting and quieter operation. By addressing the mechanical noise often found in older or high-mileage gearboxes, Spectro provides a heavy-duty solution that maintains protection and performance in demanding V-Twin transmission environments.