Customer Ratings & Reviews

I use this oil in my '02 2500 Ram Diesel to protect that engine for the long haul. The 5.9L Cummins is the last of the "loud ones" for Dodge. I want to try for 750,000 to 1 million miles before it needs any real work put into it. That sound is one of the reasons that I bought it in the first placeI love how it runs and I get great longevity out of the oil. If you run a diesel you would be crazy to not try some in yours. Worth every penny!

I have always run synthetic oil in everything, but since I bought my Duramax, I thought I'd try you product and filter. So far so good, I'll let you know in about 150000 miles.

This is the only product that I can find that is recommended for my Eco Diesel and it performs as advertised.

Great stuff wouldn't use anything else.

First time have used Amsoil diesel oil. So far so good. However I didn't notice much change in fuel economy after using Amsoil 5W40 SS diesel oil for my first oil change in this truck, in town driving. High way driving did show some improvement, all the way up to 30.2 mpg, previously had gotten 29 mpg. I think part of this is my motor is still breaking in as diesels take awhile to do so. Overall I am pleased & have used Amsoil in both of our vehicles going on 18 years.

Perfect oil.

I use this on my 3 diesel trucks. 1985, 1994 and 2001 F 350.

I am rough on my trucks farm use hauling ext... Has 300k+ doesn't lose it burn a drop still run 25k between oil changes love my amsoil

I have used Amsoil for 20 years. I like the extended oil change intervals, it saves me money and doesn't damage my equipment. I took oil samples and had them tested after 18,000 miles. They came back no wear and more mileage before changing. This was on a 1978 Dodge van with 180,000 miles. I currently use Amsoil in my 2006 Ford F350 6.0 diesel FX4 in all gear boxes, and 2012 Ford fusion. I am very satisfied with Amsoil performance.

I use Amsoil in every combustion engine that I own. Vehicle, farm equipment, lawn mowers welding machine and generator. Never had a lubrication issue with any of them. Best oil on the market hands down!

I believe in synthetics and Amsoil.

I use this product in a 3/4 ton work truck. Very high quality product.

After trying several different synthetic diesel oils over the years...I have settle on AMSOIL as the best. I see consistently better cold starts and the extended change interval is a huge plus!

I'm sold! I've used Amsoil products in all my vehicles for over 25 years. Engines run more quiet/smooth, better fuel mileage, and longer engine life. I recently convinced a friend to try Amsoil, they had an immediate 4-5 mph increase! What more can i say?!!

Really haven't noticed any real benefit over cheaper options. The cost is a major problem.

I have used amsoil in my 2008 and now my 2017 duramax. Love the reliability and superior quality of the oil.

I have found that using Aimsoil products I have added longevity and life to my vehicle. I drive around 1500-2000 miles per week. Products service my vehicles mechanical parts awesome.

I have been using Amsoil in this truck since I purchased it, it turned 210,000 miles. I have averaged 17.9 mpg over the life of the truck. It has regularly towed 17k plus. These fluids are spot on!

Used in a 2005 GMC Sierra 2500 HD, have used Amsoil products exclusively since I purchasing the truck, will definitely continue using.

I use AMSOIL in my 2007 Dodge RAM 3500, my wife's 2013 Ford Edge, 3 Waverunners, and all of my power equipment. I have not experienced any issues with any of these applications. Warranties are not voided, and fuel mileage in both vehicles is improved compared to conventional oils. My Dodge Ram has the Cummins 6.7 liter diesel with 268k miles. The truck is still purring like a kitten, and doesn't burn a lick of oil. I am still on the original transmission without any re-builds as of yet. (very uncommon for the Mopar trannies). I extend the oil change intervals to every 9k miles, even though the manual states not to extend. I have not witnessed much , if any fuel dilution in the oil. My Wife's Ford Edge has a mere 78k miles on it. I change the AMSOIL Premium oil in her car every 15k miles, even though the AMSOIL reference sheets state she could go 25k. I just like being careful. I run the marine 10W30 in the Yamaha Waverunners and have smooth acceleration, without any vibration or oil burn. Overall, I love the AMSOIL products and would recommend to anyone looking for a top end, fully synthetic, highly protective oil.