The recommended engine oil for all Harley Davidson models. We have researched the right oil to the best of our ability but it goes without saying: always consult your owner’s manual where you will find the manufacturer’s recommended engine oil. With our oil selector, you’ll be able to choose a premium oil but save a few quid on the official Harley engine oil. That’s why it’s often better to choose a synthetic-based oil over a mineral (regular) oil as it’ll have better heat tolerance. In air-cooled engine (like the ones found in most Harleys), heat can be an issue. Whether you’re running a 103, a Twin Cam or a Softail and whether you run Synthetic or Regular oil, the right oil will make all the difference. The chances are, your recommended oil will be 20W50 as that’s the most common grade for Harleys. The chart below shows you the recommended engine oil and the amount of oil you need for each model. While H-D supply their own oil, you definitely don’t have to use it to ensure your Harley runs smoothly. viscosity and quantity of oil (along with a lot of other design factors, ignored for simplicity) determines the rate of compression and rebound. Anti-foam - Eliminates foaming and air entrainment for consistent damping.This guide is designed to help you find the best oil for your Harley. The job of fork oil is to provide damping, it provides both compression and rebound damping, i.e.Viscosity stability - Viscosity stability provides long lasting and consistent performance and response, even as the suspension heats up.In the world of shocks, there are no universal viscosity requirements or recommendations. 1) No standard viscosity Your engine manufacturer recommends a specific viscosity of motor oil for best protection and performance. Minimized friction - Bel-Ray friction modifiers increase lubricity for minimum 'stiction' and for more responsive and better handling suspension over irregular terrain. Points to consider when looking for fork oil.Superior anti-wear - Unique Bel-Ray anti-wear chemistry greatly reduces stiction, friction and wear for extended suspension tubes and sliders life and more responsive and reliable performance.For fine tuning damping characteristics all grades of Bel-Ray High Performance Fork Oil may be blended with each other. Follow the fork manufacturer's recommendation for grade selection.

Recommended for all standard and cartridge type motorcycle fork suspensions on street and off-road motorcycles, ATVs and all other high performance applications.Bel-Ray High Performance Fork Oil is available in seven viscosity grades 2.5W, 5W, 7W, 10W, 15W, 20W and 30W. Through the use of carefully selected high viscosity base oils, stiction and fade are reduced providing smooth operation over a wide temperature range.

Bel-Ray High Performance Fork Oil is formulated for use in all suspension forks including those using cartridge and dual-chamber systems.

Fork oil viscosity comparison chart