99816-1040 Heavy Duty SAE 10W40

Spectro Heavy Duty SAE 10W40 is a mineral-based motor oil specifically intended for Harley-Davidson Evolution and Twin Cam engines operating in cold climates. It is recommended for use when ambient temperatures fall between -12° and +10° Celsius, ensuring rapid oil flow to critical components during cold starts. This lubricant provides essential protection against wear and oxidation while maintaining the necessary viscosity for winter riding conditions. It serves as a direct alternative to OEM 99816-1040. Spectro’s formulation ensures that air-cooled V-Twin engines remain properly lubricated and protected even when the weather is at its most challenging.