Harley-Davidson engines run hot and work hard. AMSOIL synthetic motorcycle oil is purpose-built for V-twin engines — delivering maximum protection and performance.
AMSOIL 20W-50 Synthetic V-Twin Motorcycle Oil is engineered specifically for the unique demands of air-cooled V-twin engines like those in Harley-Davidson motorcycles.
Harley engines run significantly hotter than water-cooled engines. AMSOIL's high-viscosity formula maintains a protective film even at extreme temperatures.
Formulated to work with wet-clutch systems — no friction modifiers that can cause clutch slipping.
AMSOIL offers dedicated fluids for Harley transmissions and primary chaincases — a complete lubrication solution for your bike.
Longer drain intervals mean fewer oil changes and more time riding. AMSOIL synthetic lasts longer than conventional motorcycle oils.
Join AMSOIL's Preferred Customer program for just $10 and save up to 25% on every order — including all motorcycle products.
| Product | Application | Viscosity |
|---|---|---|
| 20W-50 Synthetic V-Twin Motorcycle Oil | Engine (all Harley-Davidson models) | 20W-50 |
| Synthetic V-Twin Transmission Fluid | Harley-Davidson transmissions | SAE 80W-90 equiv. |
| Synthetic V-Twin Primary Fluid | Harley-Davidson primary chaincases | SAE 10W-30 equiv. |
| Synthetic Motorcycle Coolant | Harley-Davidson liquid-cooled models (Milwaukee-Eight 114+) | N/A |
Source: AMSOIL.com product catalog — verified April 2026. Always verify fitment using the AMSOIL product lookup tool.
Yes. Federal law (Magnuson-Moss Warranty Act) prohibits manufacturers from voiding warranties solely because an aftermarket product was used, as long as the product meets the required specifications. AMSOIL meets or exceeds all Harley-Davidson specifications.
AMSOIL recommends 20W-50 Synthetic V-Twin Motorcycle Oil for most Harley-Davidson engines. Always verify using the AMSOIL product lookup tool at AMSOIL.com.
Yes. AMSOIL Synthetic V-Twin Primary Fluid is specifically formulated for Harley-Davidson primary chaincases and wet clutches.
Join the AMSOIL Preferred Customer program for just $10 for a 6-month trial and save up to 25% on every order, including all motorcycle products.
Find the right AMSOIL oil for your exact Harley-Davidson model and save up to 25% as a Preferred Customer.