99816-1040 Heavy Duty SAE 10W40

Spectro Heavy Duty SAE 10W40 is a specialized engine lubricant formulated for V-Twin engines operating in colder climates. This mineral-based oil is specifically designed for Harley-Davidson Evolution and Twin Cam powerplants when ambient temperatures range between -12 and +10 degrees Celsius. Spectro Oils of America utilizes a robust additive package to ensure reliable lubrication during cold starts and consistent protection throughout the operating cycle. It serves as a direct alternative to OEM part 99816-1040, providing the shear stability required for air-cooled engines. This oil maintains critical film strength to protect internal components from wear while preventing the buildup of sludge and varnish in the crankcase.