Resists viscosity breakdown 6X better than Harley-Davidson* SYN3* for improved protection against compensator and transmission gear wear.1
Resists extreme heat to help keep engines clean and efficient.
Reduces wear and deposits for maximum engine compression and power.
Convenience of one lubricant for all three sumps.
*All trademarked names and images are the property of their respective owners and may be registered marks in some countries. No affiliation or endorsement claim, express or implied, is made by their use. 1Based on testing of AMSOIL 20W-50 Synthetic V-Twin Motorcycle Oil and Harley-Davidson Screamin’ Eagle SYN3 purchased on 1/26/24 in the CEC L45-KRL, ASTM D445 test.
Engineered for maximum performance in V-twin engines, motorcycle transmissions and primary chaincases. Protects
against extreme heat. Wet-clutch compatible. Advanced synthetic formulation resists viscosity loss to keep critical
components clean and protected.
Resists viscosity breakdown 6X better than Harley-Davidson SYN3 for improved
protection against compensator and transmission gear wear.1
Contains heavy treatment of anti-wear additives to reduce wear in the most extreme
operating conditions.
Fortified with maximum levels of oxidation inhibitors to fight deposits for maximum
engine compression and power.
Resists Viscosity Breakdown
AMSOIL resists viscosity breakdown 6X better than Harley-Davidson SYN3 for improved
protection against compensator and transmission gear wear.1
1Based on testing of AMSOIL 20W-50 Synthetic V-Twin Motorcycle Oil and
Harley-Davidson Screamin’ Eagle SYN3 purchased on 1/26/24 in the CEC L45-KRL, ASTM D445 test.
WITHSTANDS EXTREME HEAT
Formulated with naturally heat-resistant synthetic base oils that resist oxidation in extreme
summer heat and during strenuous stop-and-go rally or parade traffic.
Unique additive system helps keep engines clean and running efficiently in the
toughest riding conditions.
Prevented piston-ring sticking and protected against piston scuffing after 1,000 miles (1,609
km) of extreme-heat dyno testing during which cylinder temperatures reached 421°F (216°C) (see video
below).
PROTECTS TRANSMISSIONS & PRIMARIES
Shear-stable formulation resists thinning from mechanical activity to protect transmissions and
primaries from wear.
Performs like a gear lube without the negative effects of extreme-pressure additives.
Delivers the convenience of one lubricant for all three sumps.
TRUSTED BY PROFESSIONALS
AMSOIL Synthetic V-Twin Motorcycle Oil is the top choice of hardcore riders everywhere. Here’s what some have
to say.
*All trademarked names and images are the property of their respective owners and may be
registered marks in some countries. No affiliation or endorsement claim, express or implied, is made by their
use.
I’ve been using AMSoil since a little after it’s inception into the market and I will not go back to any other oils, providing AMSoil stays in business. I use it in all my vehicles, car truck & motorcycle. When I had a gas powered mower, I even used the used oil in my lawn equipment. Needless to say I’m a huge fan and when I did start using it, they had a replacement warranty on any oil related failure. I don’t know if they still have that warranty, but I’ll keep using their oil anyway. Also, when you’re a preferred customer the price is very competitive.
Better shifting transmission quieter running engine what's not to like about Amsoil
Bottom Line
Yes, I would recommend this to a friend.
Was this review helpful?
5 star rating
Amsoil 20W-50 100 Synthetic Motorcycle Oil
By 
WILLIAM, 
a 
Verified Buyer 
from 
Las Vegas 
on 
June 10, 2025
Outstanding, quality oil for those who want keep their motorcycle motors running longer due to specs that exceed manufacturers standards.
Bottom Line
Yes, I would recommend this to a friend.
Was this review helpful?
5 star rating
Harley oil
By 
OSCAR, 
a 
Verified Buyer 
from 
Nakusp, BC Canada 
on 
June 10, 2025
My go to oil for my 2010 Fatboy Lo.
I like the product as I only need to change my oil once a year and my Harley really likes that oil
Bottom Line
Yes, I would recommend this to a friend.
Was this review helpful?
5 star rating
Engine, Transmission, Primary Oil All-In-One
By 
BootCampBob, 
a 
Verified Buyer 
from 
Upstate New York 
on 
June 10, 2025
I've been running a 2022 Indian Challenger 108 Cu In V-Twin on this oil since new / break-in. The bike now has 15,467 miles on it.
Indian Motorcycles use engine oil for the clutch / transmission and primary lubrication, as well as the engine, unlike another American V-Twin maker that uses separate fluids for each, so the demand on this oil is critical for Indians. I wouldn't use this oil if it didn't out-perform everything else on the market. Not only does the engine run quieter than when using other oils (including the manufacturer's branded product, and these engines are known for being noisy), the transmission shifts easier as well.
I've used AMSOIL Signature Blend in my high performance cars and truck since 2008 with similar results. Using AMSOIL V-Twin Formula 15W60 was an easy decision for my Indian. It hasn't disappointed a bit.
Bottom Line
Yes, I would recommend this to a friend.
Was this review helpful?
5 star rating
my harley davidson go to oil
By 
DONALD, 
a 
Verified Buyer 
from 
Lake Charles, LA 
on 
June 09, 2025
i now have 196000 miles on my 04 roadking. useing amsoil products for trans and engine. went into engine once and never been in the transmission..all good
I was disappointed this time.
The "kit" came with oil, and filter, but no o-ring for the drain plug as clearly pictured and called out in the description.
No biggie, just a trip to the NAPA parts store and got the job done. QC at the assembly plant for the kit must've had the day off????
It would be good if there was a "Deluxe" oil change kit that included primary fluid and an extra qt of 20-50 to do the trans.
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