This oil from AMSoil is the best lubrication for Harley big twins in my experience. Over 50 years of riding Harleys, and these products are the best I have found, and I have tried several synthetics. None has performed as well as AMSoil fluids do. The engine noise is noticeably reduced and the it runs a little cooler, as compared to HD brand synthetic oil. The noise reduction impressed me, didn't expect that at all on my low milage twincam. (Valve train noise mainly.) I highly recommend AMSoil fluids for your Harley. I also use the Primary and Transmission fluids formulated for each component. Absolutely top notch performance and protection, none bettr!
Bottom Line
Yes, I would recommend this to a friend.
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5 star rating
Great
By 
RONALD, 
a 
Verified Buyer 
from 
Kingston NY  
on 
April 29, 2025
Super great product and a great company to deal with
Bottom Line
Yes, I would recommend this to a friend.
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5 star rating
Great all in one oil change package
By 
SONNY, 
a 
Verified Buyer 
on 
April 28, 2025
After I put Amsoil in my motorcycle, it runs so smooth with shifting. I am now 100 percent Amsoil, and when my truck needs oil change I will put Amsoil in it as well.
Bottom Line
Yes, I would recommend this to a friend.
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5 star rating
Smoothing Out My Thunderstroke Engine
By 
DOUG, 
a 
Verified Buyer 
from 
Port Charlotte 
on 
April 25, 2025
I was curious what switching from Indians 20w-40 semi-syn oil to Amsoil 20w-40 full syn might do to the operation of my Indian Chieftain 116 Thunderstrike engine. From the first ride, I was surprised that the engine ran with less vibration than before. It was also about 50% easier to find neutral (the worst of any bike I have ever owned in 50 years of riding) than it used to be.
Cheaper than Indian's oil too. Try it. You will not regret it.
By 
CHRISTOPHER, 
a 
Verified Buyer 
on 
April 23, 2025
Great quality product
Bottom Line
Yes, I would recommend this to a friend.
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5 star rating
Great oil
By 
KENNETH, 
a 
Verified Buyer 
on 
April 23, 2025
I have been using this oil in my Victory Cross Country for 10 years with no issues. It keeps the engine cooler. No issues with the clutch at all. Great product. Only issue I have is with the price why do you charge shipping?
Bottom Line
Yes, I would recommend this to a friend.
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5 star rating
Great Product
By 
DSW, 
a 
Verified Buyer 
on 
April 22, 2025
I recently switched to Amsoil from another synthetic brand for my 2022 Harley Ultra. So far very pleased with this product and find the engine temp is slightly lower and the engine noise is noticeably less. It's great to be able to order everything together (oil, filter and o ring). I also really like how easy it is to get Amsoil and get delivery right to more door typically in a day.
Always quality. Does it's job of cooling and cleaning. Hard to ask for more than that.
Bottom Line
Yes, I would recommend this to a friend.
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5 star rating
Good Stuff!
By 
DEBRA, 
a 
Verified Buyer 
from 
North Port, FL 
on 
April 21, 2025
This is the first time I used Amsoil on my 2012 sporster 1200 and I believe it made my cycle happy! It made a sound like it was drinking it! Then I changed the primary oil and it shifted better. Put the gas treatment in and that was the cherry on top!
Fast and Courteous Service very satisfied! Never had any problems with pay pal as payment just this one instance! Hopefully it’s straightened out now!
Bottom Line
Yes, I would recommend this to a friend.
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5 star rating
Great protection
By 
HAROLD, 
a 
Verified Buyer 
from 
Bismarck MO.  
on 
April 19, 2025
I purchased this quart for a top off. I'm presently breaking in a new Low Rider S. I will do my own three hole oil changes. Amsoil is better than syn 3 Harley davidson oil.
Bottom Line
Yes, I would recommend this to a friend.
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5 star rating
Great oil and filter fitment
By 
DARRYL, 
a 
Verified Buyer 
from 
New jersey 
on 
April 19, 2025
I’ve been using this oil for years and have nothing but great success would highly recommend.
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