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I won't put anything else in my primary but this stuff. I change it often as it get really dirty, I know Amsoil says it will go longer, Just old school. Love this stuff.

Great oil little expensive only use it in my 2001 Harley Davidson Fat Boy g

Runs cooler, and quite

Using Amsoil Primary Fluid in all three Harley Davidson's I own and the several bikes I routinely service for customers takes one more worry/concern off the table. With a lubricant designed specifically to work well with the chains, gears, clutch discs, springs, seals, etc. you can rest easy knowing that everything inside the primary is properly lubricated regardless of the temperatures you ride in. Get the most life out of your clutches and compensator by using Amsoil Primary Fluid. Good engine oils belong inside engines, not primarys.

Great new product

Top notch service on delivery and works well in my motorcycle

As always the best oil

Noticeable improvement in shifting smoothness and finding neutral over HD Syn 3 oil.

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

Put Amsoil primary fluid in my Big Dog bikes, shifts smooth and runs cool.

This is the only fluid I used in my Harley. Great stuff!

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.

That hydraulic clutch was real crisp now had to re acquainted with it

My HD work smoother more quiet & less clanking noise when changing gears easy to find a neutral

The best !

as always good service, and received in no time thanks

Good stuff

it much cheaper than the shop. however it would be nice if it included a plug gasket.

Use the best and this is it!