Spectro Heavy-Duty gear oil is a multi-viscosity SAE 85W140 GL5 extreme high pressure gear lubricant. This new formula will help quiet noisy transmissions in both 4 and 5 Speed Harley-Davidson Big Twin transmissions. Specifications exceed all of the Harley & API gear oil classifications GL1 thru GL5. Special additives provide improved fluid flow to bearings, easier shifting and less drive train friction.
