Customer Ratings & Reviews

Use in a ford f150 as required. Change around every 60, 000 miles. May not be necessary, but can't hurt to have clean oil. Decided to use Amsoil after reading an independent test/study on gear lubes by a major oil company. Many oils were good. But Amsoil outperformed the other oils in nearly all of the tests performed. In 1998 when I first changed the oil Amsoil was all I could get in synthetic 75w-140. Ford dealers didn't carry it and the service manager recommended using 90w, stated, "We use 90w". I said, "the diff. Tag states 75w-140! You don't sell the oil you recommend?". Wonder how may diff's ford burned up? Have used Amsoil since then.

Used in a off road truck. no failures, change every 30,000 miles and is still clear as a bell.

Used gear lube in transfer case in 2013 Acura RDX AWD. Working great.

My new F-150 only has 15k on it now and I still haven't changed the front axle but I did switch the rear over to 75-140 at 10k. Had a ford ranger that I bought new and switch it's rear to amsoil at about the same mileage. I used it for my lawn service runner. It was over loaded it's whole life up until 102,000 when I was hit and they totaled it. I sold that rearend to another guy that was going to rebuild it with a spool and deeper gears. He called me back and said it looked like brand new inside. Pretty amazing considering what that truck went through.

I typically do most of my own maintenance, but due to time constraints, I had my mechanic change the oil in the rear differential on my 2008 GMC 2500 HD truck. The truck is used as a daily driver plus towing my 10,000 lb. travel trailer. This is the second oil change. When I picked up the truck, the mechanic said "Wow, that Amsoil is amazing - the old oil looked great - hard to believe after 100,000 miles." He volunteered the response, I did not ask.

I used Severe Gear in my FJ, 3/4 ton Suburban and two Porsche track cars. It is the best gear oil out there. I use Amsoil Slip Lock with Severe Gear for perfect, noise free operation of a limited Slip in the track car. Works great.

I haven't had any issue and all gears have been working good.

I had got it to replace the old diff oil in both differentials in my 2002 Chevy Blazer LS, it works great, it accelerates smoother/ faster than the old oil, and it the vehicle had over 200,000 miles on it when I changed it, now it has over 201000 miles on it and it's still doing great!

I run this is my mini quads transmissions. It holds up better than anything else we have found. Always looks good and we seem to get longer life than the rest of the racers.

Had the oil in the diff previously and came out slightly worn looking. 70k miles. Never had any issues so far with the Limited Slip Diff locking up. Using AMSOil transfer tubes worked well also. Just had the car on ramps.