20W-50 Synthetic Motorcycle Oil

Motorcycle 20W-50 Synthetic motor oil

Formulated with the highest performance state of the art additive technology. Highest heat resistance. Multi-functional.

SKU: MCV Category:

AMSOIL 20W-50 Synthetic V-Twin Motorcycle Oil

One of our best selling products! I think it’s now the standard. If you’re not running AMSOIL in your bike you are really missing out on your bikes performance!

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Our 20W-50 is the number one best selling motorcycle oil in the world! Because it works as advertised., Advanced multi-functional formula for both domestic and foreign motorcycles. Excellent in air-cooled motorcycle engines due to high heat resistance. Can be used in engines, transmissions and the primary chaincase. Not recommended where an API GL-4 or GL-5 gear oil is required. Harley-Davidson/AMSOIL Oil Chart

Motorcycle 20W-50 Synthetic motor oilAMSOIL 20W-50 Synthetic Motorcycle Oil is a premium oil designed for those who demand the absolute best lubrication for their motorcycles. It is the result of extensive research and is specially formulated to excel in all areas unique to motorcycles, including high temperatures of air-cooled engines such as Harley-Davidson® V-Twin, wet-clutch lubrication, extreme-pressure regions of gears and chains and rust common to short trips and storage. AMSOIL Synthetic Motorcycle Oil is multifunctional and fulfills the requirements of both domestic and foreign motorcycles.

AMSOIL, the leader in synthetic lubrication, produced the world’s first API-qualified synthetic motor oil in 1972. Trust the extensive experience of AMSOIL, The First in Synthetics,® to do the best job protecting your motorcycle.

500 degree cylinder protection - motor oil maintained viscosity,

Withstands Extreme Heat

To prove its extreme-heat performance, AMSOIL 20W-50 Synthetic Motorcycle Oil was installed in a 2012 Harley-Davidson FXDB Dyna Street Bob motorcycle. After deactivating the electronic temperature controls to increase severity, the engine was subjected to extensive idle time broken by short bursts of engine revving to simulate the intense heat conditions of a rally or parade route. Despite little air flow and cylinder temperatures reaching more than 500°F, the oil maintained viscosity and delivered outstanding protection (see graph).

See our blog entry which covers a 500 degree F thermal runaway test on a FXDB Dyna Street Bob. Features a video from AMSOIL corporate. 

Reduces Wear and Deposits With Amsoil 20W-50

AMSOIL 20W-50 Synthetic Motorcycle Oil contains a heavy treatment of anti-wear additives to reduce wear regardless of the operating conditions. It is thermally (heat) stable and contains maximum levels of oxidation inhibitor additives. AMSOIL Synthetic Motorcycle Oil is extremely resistant to breakdown and engineered to prevent damaging sludge and carbon deposits for superior engine cleanliness.

Provides Extreme-Pressure Quality Protection for Gears and Chains

With AMSOIL 20W-50 Synthetic Motorcycle Oil, there is no need for separate transmission or primary chaincase lubricants. It is absolutely shear stable and will not thin out from mechanical activity. AMSOIL 20W-50 Motorcycle Oil performs like a gear lube without the negative effects of extreme-pressure additives. In the FZG gear test, AMSOIL achieved a perfect score with a “zero” wear rating.

The 20W-50 Motorcycle Oil Delivers Superior Rust Protection

Not available from any other company! An AMSOIL exclusive.

Motorcycles are prone to rust from storage, humidity and short drives. Rust can cause major damage such as roller bearing failure, uncontrolled wear, compression loss and blow-by. Good rust protection, however, comes by design and is not natural to engine oils. Unlike many motorcycle oils, AMSOIL Synthetic 20w-50 Motorcycle Oil contains special anti-rust agents. It passes the ASTM D1748 humidity cabinet rust test, demonstrating superior rust protection.

Amsoil 20W-50 V-Twin Oil Provides Excellent Wet-Clutch Performance

Yes you are hearing right! AMSOIL Synthetic 20W-50 Motorcycle Oil contains no friction modifiers and promotes smooth shifting and positive clutch engagement. It controls heat and helps prevent slippage and glazing, while its high TBN helps improve clutch life by resisting the acids that can degrade clutch material. So you don’t need a dedicated product for your primary chain case. Don’t listen to Bubba.

Amsoil 20W-50 Motorcycle Oil Resists Viscosity Breakdown

AMSOIL resists viscosity breakdown 6X better than Harley-Davidson SYN3 for improved protection against compensator and transmission gear wear.1

Prevents viscosity breakdown chart


AMSOIL 20W-50 Synthetic Motorcycle Oil is recommended for air- or liquid-cooled four-stroke engines. It meets SAE 90, API GL-1 gear oil requirements and is recommended for transmissions and primary chaincases. AMSOIL 20W-50 Motorcycle Oil is recommended for Harley-Davidson®, Buell®, KTM®, Ducati®, Aprilia®, BMW®, Triumph® and other motorcycles where 15W-50 or 20W-50 engine oils or SAE 90, GL-1 gear oils are used. Not recommended where an API GL-4 or GL-5 gear oil is required.

20W-50 Motorcycle Oil Compatibility

AMSOIL 20W-50 Synthetic Motorcycle Oil is compatible with other conventional and synthetic motor oils; however, mixing oils may shorten the oil’s life expectancy and reduce its performance benefits. AMSOIL does not support extended drain intervals where oils have been mixed. Aftermarket oil additives are not recommended for use with AMSOIL Synthetic Motorcycle Oils.

Motorcycle Oil Service Life

Recommended for use up to twice the motorcycle manufacturer change interval (miles/hours) or one year, whichever comes first, in engines, transmissions and primary chaincases. For Big Twin Harley-Davidson transmissions only, follow the Harley-Davidson recommended drain interval for synthetic oil of up to 20,000 miles or one year, whichever comes first. When using an engine filter other than AMSOIL Ea®, change the filter at standard intervals.

For off-road use, change AMSOIL 20W-50 Synthetic Motorcycle Oil at motorcycle manufacturer-recommended intervals. Racing or modified engines are excluded from extended drain interval recommendations. Oil changes are at the owner’s discretion.


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MCV AMSOIL 20W-50 Motorcycle Oil Gallon


20W-50 Motorcycle Oil Reviews


’21 Indian Roadmaster now using your motorcycle oil 

By  MITCH,  a  Verified Buyer  from  Mississippi  on  September 14, 2023

I’ve been running this oil in my ’21 Indian Roadmaster since new. Now at 42k miles and no problems at all. I can buy Amsoil oil, a high quality WIX oil filter, and get the copper crush washers in bulk cheaper than I can buy the semi-synthetic Indian oil kits for. Much better quality for the same cost using Amsoil.

Great motorcycle oil

By  KEITH,  a  Verified Buyer  on  September 12, 2023

Just bought a used Harley that the previous owner used Harley Syn oil in. I immediately order Amsoil Syn motorcycle oil. Boy did it make a difference. Can’t wait to change the primary and transmission to Amsoil products!

Great stuff

By  GENE,  a  Verified Buyer  from  South Florida  on  September 11, 2023

I have a 2006 Road King. I switched over from Amsoil 20w-50 motorcycle oil to the straight SAE 60w because of the Heat here in Florida. My bike runs cooler than before, and I recommend this product very highly

Amsoil Longevity Usage

By  Redman,  a  Verified Buyer  from  Western Mass  on  September 05, 2023

I have been an Amsoil user on my vehicles for over 20 years, when it comes to my two motorcycles, it is the ONLY oil that has ever been used on them, my older bike has over 80k miles and still runs great, my newer bike has over 45k and still runs great. Quality and price wise in my opinion Amsoil is #1!!

The Best Synthetic 20W-50 on the Market!

By  JIM,  a  Verified Buyer  from  Vandalia, IL  on  August 27, 2023

I have been using this oil for over 20 years on all my Harleys. Excellent lubrication for motor, transmission, & primary. It is my go to oil for anyone who asks.

Best motorcycle oil

By  DON,  a  Verified Buyer  from  Houston, TX  on  August 27, 2023

This oil lives up to it’s well earned reputation as the best oil on the market. I consider my Harley to be an expensive investment and will only ever use the best products available. For lubrication that is Amsoil

20W-40 Victory / Indian oil

By  BRENDIN,  a  Verified Buyer  on  August 26, 2023

Works great. Bike runs a couple degrees cooler and the shifts feel crisper, much easier to find neutral when it’s hot on a bike that is notoriously hard to find neutral

Motorcycle & Truck oil

By  JEFFREY,  a  Verified Buyer  from  Fort Lauderdale Fl  on  July 05, 2023

I’ve been a mechanic all my life and always use Amsoil , have had it tested after use and could keep it running longer . It out last Harley oil by far and is a better lubricant, I also use it in my Diesel and always will . Oil is the heart of keeping it lubed so use the best.


Reasons customers say they will continue using only AMSOIL products: (List specific to our motorcycle customers)

  • Measurable lower temperatures under load
  • Instant noticeable performance
  • “It freed up the engine” – I get that one all the time
  • Product lasts longer – more miles and the filter brings added peace of mind
  • Addresses issues which happen in storage – off season
  • No more feeling that the engine was suffering when idling long in traffic or pushed in high ambient temperature extremes. – No loss of oil pressure
  • Customers know AMSOIL’s tech is there for feedback to to discuss issues
  • Measurable increase in fuel economy
  • MADE in USA

We hope you stop in and try our motorcycle oils and lubricants and discover first hand why people swear by AMSOIL products!! You’ll feel it in the throttle!

We can also ship saving you money too!!  Call our shipping department at 800-579-0580. We can also supply to Motorcycle Shops so call us to get your account qualified today!

Note: In typical Harley Davidson motorcycles our single product the MCV 20W-50 synthetic can be used in all three sumps OR we also have Primary and Transmission specific products. Call any time with your questions.