Customer Ratings & Reviews

Just changed to this primary oil. Clutch engagement is smoother & finding Neutral is also easier. Thank you Amsoil!!

This is top shelf primary fluid. Here in Florida heat is always a concern and this is the best for the cruel conditions here. Running 95 for 2 hours no problems with any breakdown.

Great clutch feel. Change every 5k or once a year.

I really like the way you can see the amount of oil remaining in the bottle. Makes it easy to pour the correct amount

The AMSOIL Synthetic V-Twin Primary Fluid is awesome for my primary chains long life and for the clutch, and primary chain tensioner. I never believed the engine oil is good in all three holes on a Harley Davidson motorcycle. I use fluids specially designed for each area on my Harley Davidson motorcycle. I plan to ride my Harley for many, many more miles. I highly recommend AMSOIL Synthetic V-Twin Primary Fluid to anyone who want the best performance out of their Harley.

Used in my 2016 HD Triglide with 111,589 miles. The clutch operates much smoother than using Syn3. Will use this product again. Excellent.

Amsoil makes everything run so much smoother and quieter

Been using this for many years, works great have never had a clutch problem using it.

It was hard to shift to neutral by now I change my primary oil and it is really smooth now

Great product bike runs quieter, cooler and smoother

Love the results with this product!

This stuff does the job protecting the primary from wear.

Really good oil. It is very good. I recommendit to all big v twin owners

Best product on the market for my Harley primary

eliminated hard knock at cold starts and overall shifting much improved 2015 road king 3500 mile mark introduced Amsoil. 12,500 and I'm sold on it. Used their filters too.

I immediately notice a difference right after my first oil change. After switching to Amsoil, I could not believe how much smoother my clutch functioned. Don't waste your money on other brands, just buy the Amsoil.

I use Amsoil in all three holes in my twin cam it quites my rocker noise and the trans shifts much smoother and can find neutral way easier. I LUV THIS OIL

My Fatboy shifts smoother and is quieter since switching over to amsoil primary and transmission fluids.

Started using this on last 3 hole change. Noticed better shifting right away. Recommend product!!!!

I switched over to the AMSOIL for the same reason as the transmission fluid, I don't think you should run motor oil in the primary. I'm getting easier shifting and the clutch doesn't sound like it's trying to slip when I roll on the throttle hard.