Customer Ratings & Reviews

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.