Customer Ratings & Reviews

Your products are great .I now have my son using them & he does more research than anybody I know

When I found out this was available, I started using it. I need to get the other fluids switched over.

Have used this for many years in my Diesel engines and through all of the improvements in formulation over the years it has been very high quality especially matched with the Amsoil 20 micron filters. And the bypass filtration quality of the 2 micron really extends the life and fuel economy characteristics of this specialized Diesel formula. Fuel economy being most important, and the smooth sound of the engine never varies over many many massive highway miles...

I've been using Amsoil automotive oils and greases almost 20 years. Personally I have seen proven protection of high load/wear bearing surfaces, cylinders walls, and camshaft lobes, enough to swear off OTC products and I don't run anything else. The slightly higher costs I've paid for Amsoil products are offset by my overall savings in vehicle, motorcycle maintenance, and what I feel based on experience is unusually extended and trouble free vehicle service life since I began using Amsoil products on my personal vehicles and my family's vehicles. My opinion is Amsoil products rate of return begins immediately once it is. Amsoil keeps engines clean which helps protect the motor better. Amsoil does protect internal wear surfaces better than any oil I've compared it to. Testing different oils led me to Amsoil and I haven't turned back since my first purchase, For me OTC oils just don't compare to Amsoils quality of their products. Amsoil has proven time and time again that it can go the distance, more than a few times my family has driven well beyond the distance advertised, with no concerning lubrication deterioration. The huge cost of regular maintenance is overshadowed by all of the money my family and I have saved by not having to perform highly unnecessary shorter service intervals, the biggest part of the huge expense of owning a vehicle. The money I've saved from being able to extend maintenance intervals with pretty much trouble free service from my vehicles from using Amsoil products is one of the best benefits the Amsoil synthetic

I have a 2003 Ford 6.0 powerstroke. If you know a bit about them, oil has more functions in this motor than usual. Typically, I run T6 Rotella, which is great. Was very surprised when I could feel the difference with this product. Worth the extra money

Smoother running and cooler oil temps when pulling my RV. Only about 1,000 miles on my first AmsOil oil change but I am happy with my trucks performance since making the change.

this is the only oil i use in both my truck and i tell everyone to use it

Had to use my truck in some of the coldest day -40 and colder and never missed a beat great product

I owned a auto repair shop for 45 years Have used there products in my vehicle Never had anything oil related problems Great product.

I switched using my conventional oil to Amsoil in my duramax. The only reason I gave it a 4 was I need to see the results when I do a filter change. If it looks good then I will buy the oil bypass system to get cleaner oil.

Amsoil synthetic oil is by far the best oil on the market, keeps the engine cool, it has instant oil pressure, even in cold weather.

the only oil I use in my truck

The max duty product is second to none. Use with confidence. If you’re looking for a 5w-30/40 synthetic oil and truly want the best (actual synthetic blend) on the market that’s available to order and will arrive at your door fast…look no further.

I highly recommend this motor oil for all your diesel trucks.

This is the second time if used thin in my 2019 John Deere 2025r. It definitely makes the engine quieter and noticed a little smoother as well!

With the current inflation ridden prices on Diesel oil, Amsoil is no longer high priced. Signature series is great Oil.

Always performs well reduced engine temperatures when towing with my truck dodge 2500 Cummins diesel also my sons 6.7 ford while towing keeps temperatures down, I have been a dealer as well as a preferred customer 13 years Using Amsoil and still going strong Motorcoach, tractors and small engines

Excellent product and quick delivery

Great oil.

I had ordered 15W40, I received 5W40 by mistake, I had to pay return shipping and even though I had asked them to exchange it, they refunded my money and I had to reorder what I originally ordered in the first place. Product great, customer service awful.