The Liqui Moly 4 Stroke Fully Synthetic HD Street 20W-50 Oil is a fully synthetic motor oil designed specifically for use in air and water-cooled four-stroke motorcycle engines, particularly those like Harley Davidsons. It's formulated with carefully chosen base oils and high-quality additives to ensure optimal lubrication, superior engine cleanliness, and excellent friction across all operating conditions. It works equally well with or without a wet clutch system. This oil is developed for year-round use in both road and off-road motorcycles, including those used in racing, handling normal to extreme conditions. It's particularly suitable for Harley Davidson V-Twin engines that require a synthetic motor oil with a viscosity rating of 20W-50. Key benefits include its stability against ageing and viscosity changes, exceptional wear resistance, outstanding protection against corrosion, maintaining high engine cleanliness, and excellent stability at high temperatures. These qualities make it an ideal choice for riders looking to maintain peak performance and longevity in their motorcycles.