Customer Ratings & Reviews

My Cummins engine has runs smoother and better with Amsoil. I switched from Rotella which is a great oil but, hands down Amsoil is the best !

I started using Amsoil signature-series-max-duty-synthetic-diesel-oil-15w-40 in my 2009 gmc duramax diesel when I bought it new on the first oil change and every oil change since. My truck has almost 200,000 miles on it. Still runs strong and uses no oil between oil changes. Won’t use any oil but this Amsoil oil.

I would highly recommend this product

The only oil products I use!

I use my 2004 GMC 2500HD with the 6.6 Duramax to tow a 32' living quarters horse trailer. The truck is also my daily driver so I need dependability whether running errands or pulling the trailer. I have been using Amsoil since I bought the truck used with 88,000 miles on it. I now have 242,000 on the odometer. All of my fluid are also Amsoil and I have the dual remote oil filtration system. The Duramax purrs and never runs hot, even pulling up long grades.

I have been using synthetic oils from Amsoil for years with great success and when I purchased a Dodge diesel pick-up I immediately put the Amsoil synthetic oil in it also. I trust Amsoil products completely and recommend them all the time.

Great quality oil

Actually added a couple of mpg on my 2003 Duramax. Like the product.

Trucks are expensive buy the best oil and save money

Even the local Ford place recommends and will service my F250 with Amsoil

Best oil on the market love it

Good oil, have over 7000 miles and still clean for a diesel.

BETTER COLD STARTS AND WARM WEATHER PRESSURE THAN SYN ROTELLA I CAN'T THINK OF ONE THING I DONT LIKE ABOUT THIS OIL

As always amsoil performs great. Cold starts are much easier, and the oil flows much more readily based on oil pressure readings. I’ve ran amsoil products in everything from motorcycles to diesel trucks and can’t recommend it enough.

Absolutely the best oil I’ve ever used.

Love this product

I have been using Amsoil products for 30 years. Need I say more???

I love being able to order direct from amsoil . It is extremely convenient and the quality of the products is second to none.

I use this oil in my freightliner Cascadia and in my 2017 powerstroke with an Amsoil bypass filter with regular oil analysis this oil has proven itself.

I like to try and test oils in my vehicles. Ever since my oil analysis kept coming back positive from a 3rd party oil analyst company, I have stuck with AMS. It seriously is not snake oil. And my trucks love it. Idle quiter and sustained fuel economy improvement. Meaning that it stays constant with fuel economy. It doesn’t jump up or down, just level.