reason for 4 stars is that i put the temperature gun on the head and
it was definitely 15 degrees cooler than with other oil . i mostly ran
hd stuff for the shovel
still to early to tell as riding has been limited due to weather
for the 70 miles i rode im happy with the motor oil
I know Harley says you can use the same oil in the primary and transmission, however since Amsoil has done their R&D, I feel they know better than me so I choose to use the specific oil for each specific application. In the many years of using Amsoil primary fluid I have never had an issue.
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