AMSOIL 20W-50 100% Synthetic V-Twin Motorcycle Oil

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AMSOIL 20W-50 100% Synthetic V-Twin Motorcycle Oil

AMSOIL 20W-50 100% Synthetic V-Twin Motorcycle Oil (MCV) is the popular SAE 20W-50 synthetic for Harley-Davidson and Buell V-twins, plus other domestic and import motorcycles that call for a 20W-50 grade in the engine, transmission, and primary chaincase. The formulation is built for the heat of an air-cooled big twin, the friction demands of a wet clutch, and the gear and chain loads on bikes that share one oil across the engine, transmission, and primary chaincase.

Resists viscosity breakdown in V-twin transmissions

Hard riding can break down a 20W-50 oil over time and let it thin out, which leads to faster wear in the compensator sprocket and the transmission gears. AMSOIL 20W-50 Synthetic V-Twin Motorcycle Oil holds its viscosity six times better than Harley-Davidson Screamin' Eagle SYN3 in the industry-standard CEC L45-KRL and ASTM D445 viscosity tests. Both oils were purchased on January 26, 2024 and run through the same test protocol. The result is a 20W-50 that stays in grade longer in the parts of the bike that work an oil the hardest.

That stability lets one bottle cover the engine, the transmission, and the primary chaincase on a Harley-Davidson V-twin without the side effects of the extreme-pressure additives found in a dedicated gear oil.

Withstands the heat of air-cooled V-twin engines

Big, powerful V-twins run hot in slow summer parades and stop-and-go traffic. AMSOIL 20W-50 Synthetic V-Twin Motorcycle Oil is built on heat-resistant synthetic base oils that fight oxidation in extreme heat, plus a heavy dose of anti-wear additives that keep metal-to-metal contact down as oil temperatures climb. In 1,000 miles (1,609 km) of dyno testing with oil temperature at 300 degrees F (149 degrees C) and cylinder temperature at 421 degrees F (216 degrees C), the oil kept piston rings from sticking and protected against piston scuffing for full compression and power.

Wet-clutch friction control without friction modifiers

Wet clutches need a JASO-rated motorcycle oil, not a passenger-car oil that contains modern friction modifiers. AMSOIL 20W-50 Synthetic V-Twin Motorcycle Oil contains no friction modifiers and meets JASO MA and MA-2 for smooth shifting and positive clutch engagement. A high total base number helps extend clutch life by neutralizing the acids that build up and attack clutch material between oil changes.

Rust protection for stored and short-trip motorcycles

Motorcycles spend long stretches parked, and short rides never get the oil hot enough to boil off the moisture trapped inside the engine. That trapped moisture is what causes roller-bearing failure, internal wear, lost compression, and blow-by. AMSOIL 20W-50 Synthetic V-Twin Motorcycle Oil includes anti-rust additives and passes the ASTM D1748 humidity cabinet rust test, which makes it a good fit for bikes that get parked a lot or only see short rides.

One product for engine, transmission, and primary

If you would rather keep one bottle on the shelf instead of three, AMSOIL 20W-50 Synthetic V-Twin Motorcycle Oil is rated for the engine, the transmission, and the primary chaincase. Using one product in all three places simplifies oil changes on Harley-Davidson Big Twins and similar V-twins that call for 20W-50 in every compartment. Riders who would rather run a separate primary or transmission fluid can keep doing that without affecting how the engine performs.

Recommended applications and service intervals

Use in motorcycles that require a 20W-50 motorcycle oil and any of the specifications listed below, including Harley-Davidson and Buell V-twins. The oil is also suitable for motorcycles that require an API CH-4 oil. Specifications met include JASO MA/MA-2, API SL, SH, SG, CG-4, and CF, plus ISO-L-EMA2. Do not use where an API GL-4 or GL-5 gear oil is required.

• Engines, transmissions, and primary chaincases, normal service: up to twice the motorcycle manufacturer change interval (miles, hours, or one year, whichever comes first).
• Big Twin Harley-Davidson transmissions only: follow the Harley-Davidson recommended drain interval for synthetic oil of up to 20,000 miles (32,187 km) or one year, whichever comes first.
• Off-road use: change at motorcycle-manufacturer-recommended intervals.
• Racing or modified engines are excluded from extended-drain-interval recommendations. Oil changes are at the owner's discretion.

Pair MCV with an AMSOIL Motorcycle Oil Filter to support extended drains. When a non-AMSOIL filter is fitted, change the filter at the standard interval. The oil is compatible with other synthetic and conventional motor oils, but mixing shortens its service life and reduces performance benefits, so extended drain intervals are not supported on mixed oil. Aftermarket oil additives are not recommended for use with AMSOIL Synthetic Motorcycle Oil. For fit by bike, use the AMSOIL vehicle lookup guide.

Typical technical properties

Order AMSOIL 20W-50 100% Synthetic V-Twin Motorcycle Oil

AMSOIL 20W-50 100% Synthetic V-Twin Motorcycle Oil ships in the quart bottle (MCVQT-EA), case of 12 quarts (MCVQT-CA), gallon jug (MCV1G-EA), 55 gallon drum (MCV55-EA), and 275 gallon tote (MCV27-EA). The product is Warranty Secure and is backed by the AMSOIL Limited Warranty when used as directed. For viscosity, JASO, and primary-chaincase guidance across the V-twin and metric motorcycle range, review the AMSOIL motorcycle oil guide and the best oil for Harley-Davidson guide before placing an order. Order Now.

Frequently asked questions