Anything Ams is too quality top notch beats everyone else. If you don't believe me get an couple old pans and an OUTDOOR camp stove. Put AMS against anything else and I garantee it will shock you. Be careful. I simply won't put anything else in my vehicles or toys.

I have used other brands’ cheaper full synthetic engine oils in the past, but after switching to Signature Series oil in my ‘97 12v, I have noticed quieter and smoother engine operation from the oil change alone. My truck is going on 400k miles, and it’s safe to say it will the Signature Series treatment going forward.

I broke my 2003 duramax in and switched to Amsoil 15-40 and now have over 800,000kms on it with out ever removing the valve covers and it is still running strong

I have a lifted 2014 ram 2500. since I start using amsoil it runs smoother and quieter for longer. I 100% recommend them

Ordering from AMSOIL is always super fast shipping and the best quality of oil out there. I run it in all my Vehicles which is including my 18 turbo RZR and my built Harley.

Been running this oil from new purchase 2016 of truck

This is the best oil out there! I won’t use anything but amsoil product in my truck and car

I like Amsoil's quality and their constant testing.

We go 8000 mi. Between oil change now

Like the title says great oil, and it was in stock when I ordered it, and arrived with in a week of ordering. Planned on changing to Amsoil, and when the stores supply of the other brand I had used I changed.

I have your products in racing with great success. The diesel oil is for my wife’s truck which she makes trips to Tennessee, Missouri,Kentucky,& Texas pulling a43 ft horse trailer I like make sure things are protected the best way possible I believe Amsoil does that.

Best oil on the market! You can actually feel the difference when you put some between your finger tips. I trust this oil in my '96 Powerstroke for a year at a time. (I don't put a lot of miles on it in a year).

1990 Jeep YJ 4.2 I run 5w-40 (winter) 5w-50 (summer) NJ I was a Rotella user for years. This engine needs dino oil because of its high zinc content. Amsoil Diesel oil is just plain better imo. Cold starts are quieter. This motor has been bored & stroked to 4.7ci with a mild comp cam. I have higher oil pressure at idle and at speed than Rotella. 10 more psi at 55mph. and around 5-7 psi increase over Rotella at idle. Gas mileage has improved as well. The motor just seems to run smother. I was hesitant to switch but I'm glad I did. Sorry Rotella. But the improvement from Amsoil is obvious. Thank you Amsoil.

Always use Amsoil in my diesel truck, tractor, cars, small engines , and air compressors. Nothing better.

Really great for my 1-ton Ram.....

I’ve been using in my Ram EcoDiesel for 115,000 miles. SeemS to be working well time will tell!

Awesome oil

Been a long time user and most recently in a 2015 Ram eco diesel. About 107,000 miles on it and has never leaked a drop, used a drop nor had any oil\engine related issues. Same with prior 1-ton Dodge dually and Ford F350 diesels. Shipping has always been quick and picking up from Orlando, FL on visits I've found the order ready and the folks helpful.

Very good quality, I use on my 21 silverado duramax, and I love it, I recommend this product

One and done per year. I like their products across the board.