AMSOIL 100% Synthetic Metric Motorcycle Oil 15W-50
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Maximum Film Strength for Air-Cooled & Performance Engines
AMSOIL 15W-50 Synthetic Metric Motorcycle Oil provides the thickest protective film in the metric lineup with an HTHS viscosity of 5.7 cP. Built for air-cooled and high-performance engines in Ducati, KTM, BMW, Royal Enfield, and Triumph motorcycles that generate extreme operating temperatures.
Key Benefits
- Thickest protective film in the metric lineup (HTHS 5.7 cP)
- Built for air-cooled and high-temperature engines
- Lowest NOACK volatility (3.8%) — minimal oil consumption
- Smooth, confident shifts with wet clutch compatibility
- Superior rust and corrosion protection (11.6 TBN)
- JASO MA2 certified
Technical Specifications
| Property | Value |
|---|---|
| Kinematic Viscosity @ 100°C, cSt | 20.2 |
| Kinematic Viscosity @ 40°C, cSt | 140.7 |
| Viscosity Index | 165 |
| HTHS Viscosity, cP | 5.7 |
| Flash Point | 238°C (460°F) |
| Pour Point | -39°C (-38°F) |
| NOACK Volatility, % weight loss | 3.8% |
| Total Base Number (TBN) | 11.6 |
Industry Certifications & OEM Approvals
API
- SN
JASO
- MA2
Pros and Cons
Pros
- Thickest protective film in the metric lineup (HTHS 5.7 cP)
- Built for air-cooled and high-temperature engines
- Lowest NOACK volatility (3.8%) — minimal oil consumption
- Smooth, confident shifts with wet clutch compatibility
- Superior rust and corrosion protection (11.6 TBN)
- JASO MA2 certified
Cons
- Premium Investment: Higher initial cost compared to conventional or "shelf-brand" synthetic oils.
- Limited Local Retail: Primarily available through authorized dealers and specialized synthetic outlets. National Synthetics is a local stocking dealer. Call 1-678-944-8816 to confirm in-stock items for same-day local pickup.
Get AMSOIL 100% Synthetic Metric Motorcycle Oil 15W-50 Today
Order directly through National Synthetics for Preferred Customer pricing and fast shipping.
SHOW MY PRICEIndependent AMSOIL Dealer #1858536
Frequently Asked Questions
15W-50 is commonly used in BMW, Ducati, KTM, Royal Enfield, Triumph, and Yamaha motorcycles — particularly air-cooled models that run at higher operating temperatures. Check your owner's manual to confirm.
Air-cooled engines run hotter than liquid-cooled engines. The heavier 50-weight rating and 5.7 cP HTHS viscosity maintain a stronger protective film at elevated temperatures, preventing metal-to-metal contact under extreme heat.
Customer Reviews
See all 400 reviewsGreat oil
Great product
Great oil
I run this oil in two Pan Americas. In my 2022 model when I bought it used it had 4500 miles on it, owned by a HD Master Tech. Always used HD 15w-50 oil. I changed oil in it as soon as o bought it, using Amsoil 15w-50 Metric Motorcycle oil. The magnetic drain plug was covered either fuzz when I drained the HD oil. After 3500 miles with the Amsoil, I changed the oil again and there was very very little fuzz. Just one spot on the mag was lug. With the Amsoil the bike starts quieter, no valve train rattle, shifts better, runs quieter. The other PA was purchased new 2024, nothing but Amsoil has been in it since new, never any fuzz on the drain plug, starts and runs quiet, shifts great, runs cool. Amsoil is the best protection policy for the drivetrain you can buy. Great stuff!!
Amsoil 10w40 Metric Motorcycle Oil
I use this oil in both Motorcycles and It's the best. Superior protection against thermal break down. I noticed that I gained a little bit of horsepower and the engine runs cooler even in 90°+ days in traffic. My Motorcycles never overheat.
The best in the world
You can never go wrong with Amsoil…
BEST OIL EVER
I was having a problem with my cam am spyder with a chirping noise, from a certain brand oil that is made for my bike. It created a chirping noise when throttling into 1st gear after oil change. I swapped the oil to AMSOIL METRIC and that was the best decision ever, Bike runs better than before. Now all I will ever run is AMSOIL in my bike my truck and my jeep. WONDERFUL PRODUCT.
Dump whatever your running in your bike and use this
I absolutely love Amsoil products and have been using them for years. I’ve torn down my fair share of motors, this stuff is phenomenal especially in FL temps. Dump whatever else you’re running in your bike and pick this up. You will be glad you did.
Worth every cent.
I've used this oil in both my Aprillia Tuono and BMW R9T Pure. My bikes run cooler and the miles per gallon have increased slightly so far.
It's Amsoil, enough said?
Just another great lubrication product from who I consider the industry leader in synthetic oil. Just changed the break in oil in my Royal Enfield Bear 650. All my bikes get Amsoil.
Only thing that goes in my bikes
This goes in my track bike, adventure bike, trail bikes and all my high load motos. This keeps everything new and running long.
Top quality protection
My BMW R1250RT loves this oil. Between scheduled services every 6,000 miles, this oil maintains itself and does not burn off. By contrast , the "factory" labeled oil does, needing 1 quart added in the same 6,000 mile timeframe.
The best oil for my motorbike.
My ride, a Yamaha Venture Trans-Continental (1900) is running smoothly with this oil, the engine and the transmission. I used this kind of oil before, on Kawasaki Concours 14 and on Yamaha Roadliner. It's a very good oil and you may do a lot of kilometers ( more than the norm) with the same oil without any hassle. When the best product is available....you use it!!
Another family vehicle joins the Amsoil club
I’ve been using Amsoil in my family’s cars & trucks for over 15 years, so I have high hopes after buying a used 1996 Honda Magna 750 with 22k miles. Amsoil has been excellent in all our vehicles. Increased protection and mpgs plus reduced wear is the name of the game! My cycle’s V4 engine runs smoother and quieter with 600 more miles after an Amsoil oil change.
Motorcycle oil
Used this for years in my Bandit. The wear on overhead cam is very minimal. Best oil ever.
10w40 metric
Excellent product for my 1700cc vulcan. Used Kawasaki oil before. Will stick with Amsoil. 👍
the testing data shows the quality of this product
my goldwing shifts smoother using this product
Motor oil
Best oil you can buy for your motorcycle, shifts quiet and smooth, very best oil.
Proof is in the shifting.
I have a 2007 Suzuki 1250 Bandit S that I bought new, it has close to 100,000 miles. As a commuter and tourer the Bandit is heavy on the torque and lends itself to spirited driving. I have used other name brand synthetic oils in the Bandit but always changed oil at 1600 to 2000 because of annoying "clunky" shifting. Upon first using Metric over 10 years ago I found myself changing oil at the 2500 to 3000 mark only because it made me feel better not because of shifting issues. I flip flopped a couple of times with other brands and the Clunk would come back around 1600 miles. Amsoil is the only oil that holds up to rigors of my Bandit.
Lowered engine temperature
Started using Amsoil several years ago and my CanAm Spyder shifted better and ran cooler.
Used in my 2018 Goldwing DCT
I have used Amsoil for all my vehicles for over 6 years now. I was not sure if I should use for the Goldwing Automatic DCT which I had just purchased. I called Amsoil and they told me it was totally fine. I did an oil change and DCT filter change at 4k miles. I could not believe the change. There is a little click when the bike changes gears. After the change I could only hear it a little 1st 2nd and 3rd but totally quite 4th 5th 6th and 7th. Also, when it shifted you could really feel the pull in the next gear. Awesome!!
Amsoil Products
'I've only used Amsoil Oil products for my cars and motorcycle for the last 20+ years, maybe longer. My Goldwing runs great on Amsoil, as does my VW TDI and Audi. There are cheaper oils, but I keep my vehicles on average, 12-15 years, never an engine or tranny issue with any of them. Cold starts in Winter are great.
V strom 1000
I have run Amsoil in my 2005 Suzuki V Strom thousand Sense new have over 108,000 miles still runs strong doesn’t burn any oil or smoke in the plugs are all clean
No other oil compares
For years I used every major brand of motorcycle oil on the market on my Harley's and within the last fifteen years my Honda Goldwings. After changing over to Amsoil Metric, the Goldwings transmission shifted much smoother and quieter than any of the other oils including the Honda motor oil. It was such a noticeable difference that it was shocking. The right motor oil makes a huge difference.
Independent AMSOIL Dealer #1858536. Product information sourced from AMSOIL. Visit AMSOIL.com for the most current product details and availability.