Customer Ratings & Reviews

This product is spectacular, immediately noticed improved performance in my truck and I would not use any other brand besides amsoil for diesel engines!

I use 5W-40in my 3VW TDI WHEN I TOOK a trip to AZ 122 temp I seen my oil in my Commons diesel pick up to literally evaporate the oil. In Wisconsin, my truck doesn't use any oil. In outer Arizona, it evaporates the oil.

This is the only oil that I have found that does not cause me problems with my diesel exhaust filter. No regens since I have been running it. Ram 1500 ecodiesel.

I’ve been using AMSOIL in my Ram 2500 motor and transmission since I had to replace my Transmission. My Transmission has never had anything other than AMSOIL in it. At the same time as the new transmission I did a AMSOIL engine flush and after a little over 100 miles drained it and added the AMSOIL and AMSOIL filter and it’s worked great. I change my oil every 15,000 mile with fresh AMSOIL and a filter with no issues. I also changed out my coolant and my truck highway miles is down in temp. No complaints from me.

We used to run Amsoil in oil fleet vehicles years ago, don’t know why they got away from it. Anyways, I run a 2019 Chevy DRW, bought it with 92k. First oil change I did, went with Amsoil Signature. Went to oil change interval recommended by GM (approx 7k miles). I tow a 14-16k 5th wheel light/ moderate distances several times a year. Had the oil tested by a 3rd party, analysis came back I could go to 10k. Levels tested still well above normal for oil with the mileage and oil filter was still good. Don’t know how they could test that, but they did. Went 10k miles on next interval, had it tested again, same tests, same company. Analysis came back less than before, but still above acceptable levels according to them. Have a sample from 15k miles waiting to be tested. I can say, all of my vehicles now use Amsoil signature!

Ordered product and came very fast! Very satisfied with company. Thank you. A

run this in my generator for a peace of mind knowing it's the best

Best oil

I have been using this in my truck for 27 years and my truck still runs great. 352,000 miles.

This exact oil saved a motor that blew a head gasket and lost all but 2 of the 14 quarts. Ford mechanic was amazed at how good the cylinders still looked. He stated he had many that had the same problems but all the others the motor was trash. Mine just had to have a new head gasket engine flush fresh oil and antifreeze. Then was back on the road.

This oil is the only oil I’ll use on my diesel truck!! She’s 11 yes old and runs like a champ

I use this oil in my M35A2 multi fuel deuce and half stays clean longer engine runs better this is a high quality product

Great product, great package.

use Amsoil products on all my equipments

Have used this oil since OEM break-in oil on my 2018 RAM 3500 w/ Cummins HO 6.7. At 3000 mi switched to Everything AMSOIL! I get yearly oil analysis reports on this oil and it comes back fantastic every time. It’s well worth using diesel oil and AMSOIL filters too.

Switched from royal purple to this because the LB7 would not hold oil pressure when it was hot and it was burning oil and it never did before using the purple. Truck now holds oil press at 30 at idle when hot and is back to not using oil. Will not use anything else in this truck now

This product has the best anti-wear properties offered by any manufacturer. The 2.5gal jug is exactly what my vehicle requires. Customer support is amazing. The wide range of products offered by Amsoil makes them a one stop shop for any internal combustion engine you may have. I highly recommend Amsoil for your next and future needs!

I have a 2019 and 2023 Duramax and I always use Amsoil it both. The oil pressure and temp stay very consistent doesn’t matter if it is fresh or at 8,000 miles.

First truck I have used it in. The ram 2500 diesel to expensive to put cheap oil in. Very happy with it my oil pressure is a little lower and I change it every 15000 per Cummins. Oil is as clean (particule wise as the first day) Only the best for my truck.

Use 15-40 synthetic diesel oil also in differential