Customer Ratings & Reviews

I have tried a bunch of trans fluid trying to get the trans shifting smooth on my 2016 Harley Davidson ultra. The AMSOIL severe gear is by far the best thing I have used, shifts are smooth and easy! Plus it looks clean. Good looking stuff going in. I use AMSOIL in the trans, primary and engine , absolutely love AMSOIL!

So easy to fill and no waste! Highly recommend this and is a great product.

very good replacement

very good replacement

75w85 severe gear is a yes for me! Decided to switch from oem toyota oils for differentials based on others suggestions. Bought 7 just incase and used 5.8 for both, even with a little shot to flush each oil after drain, so you 6 needed for those wondering. As a very picky person who CDO (OCD, alphabetically the way it should be) I can say for sure the fluid made a notable improvement, especially with the light humming sound when I was in 4x4 that is now gone with the new fluid. The fill bags are a great benefit as well. Cut one fill cap and moved it to the next bag, draining the last of each used bag into the next as I filled. Only wish Amsoil would come out with a 75w gl4 for the transfer case oil to help avoid the #120 a liter oem oil. New to Amsoil and a can now be considered a new and growing fan boy. Thanks to the engineering team at Amsoil for their incredible product.

My Diesel Ram and my motorcycles run on AMSOIL I have us this products for years they manufacture the best lubricants.

The High Quality of the 80W90 convinced me that I should use ALL of the Amsoil products made for my Duramax truck. I see now why once someone uses this brand of gear and engine oil- they never use anything else

Replaced the fluid in my Mustang gt. I did it preventative and didn’t notice any changes however I think it’s better quality than Motorcraft.

Hi I am very happy with this product it is a high quality product that I can completely count on at every level .

This is a game changer in ease of use. Makes life a lot simpler and the quality of the Amsoil product Is a bonus.

Worth the extra few bucks to have a high quality lubricant in the differential, thank you amsoil for bringing a great product to my door quickly and priced fairly, working awesomely!

got this for 2nd gen tacoma differentials. the bag is awesome, beats using a pump. oh ya, get rid of those 10mm hex plugs that strip in the front dif!! replace them with some that take a regular socket - fill plug is m18 drain is m24 threads

I love how easy it is to spray the bags in , beats using a pump. I trust amsoil is as good as they claim to be

Awesome product, and the flexible pouches makes the job volumes easier.

I am about to embark on a cross country journey with my wife to camp, hike and 4Wheel the U.S. and I knew there was only one brand I wanted to trust from past experience so I came to Amsoil and luckily I found this which has a better viscosity and I know I will be good--- with a few more changes during my few hundred k travels.

Great product and the differentials is one place where the extra money for Amsoil lubricants is 100% worth it

The easy fill packs make refilling much easier. It's more economical than the Motorcraft Fluid. I am also a fan of having it delivered to the house. I installed a new Banks Differential Cover. It's the fluid recommended by Gale Banks himself. So I am confident it exceeds the OEM fluid from Ford with is nearly 7 dollars a quart more.

I have been using the severe gear 75W-140 in my Harley Davidson 6 speed transmission for a few years now. There are clunky transmissions but it seems to quite the tranny a little. Bit I feel more secure with it in their knowing all the issues HD.s have with 3rd gear on these transmissions.

Quality Gear Oil, long lasting and minimizes wear. Noticeably less metal on magnetic drain plug.

Great stuff just wish they sold friction modifier for Ford differentials.