This oil is great and will only use this oil! My Harley runs cooler and smoother. I change my engine oil every 5k but the transmission and primary I go 20k and 40k with this oil. At 20k oils still looks new!
Since Amsoil came on line I have used it in my HD motorcycle. The 20w-50 oil long life and quality makes me confident that my HD engine is protected. We ride a lot in the mountains which produces a lot of heat - Amsoil keeps the temperatures within the standards and keeping me happy. I've been a preferred customer for many years and the service when I order is easy and delivery is quick. Never fail oil or customer support.
If you ride a H/D, please do yourself a favor and use ALL the products. Pay a smidge more for the best quality, your bike will reward you for it now and in the future.
Bottom Line
Yes, I would recommend this to a friend.
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5 star rating
Synthetic Oil
By 
JOE, 
a 
Verified Buyer 
from 
San Rafael, CA 
on 
September 07, 2021
AMS Oil is the only supplier for this grade of synthetic oil. I use it in my 1977 Yamaha XS750D. The oil works very well, with reduced engine temperature critical on an air-cooled engine. I also expect less wear on internal components.
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