I have a 5.9 cummins ram with a fully built compound turbo set-up and Goerend transmission. The truck makes 800+ HP at the wheels and I drive it quite hard. I have only used and will only use Amsoil products for this build. I am 63 and and have seen and used different products over the decades. It is so nice to now just look at the Amsoil website and order what I need for whatever I am working on. I have always told my sons "oil is cheap, engines are expensive"

This oil works great and protects my engine. It was easy to order and arrived quickly. Thanks

I ordered this oil because i saw very good amazing reviews and honestly its one of the best oils I've used in my truck gives great protection and great milage

I've been very happy with the customer service with Amsoil for a long time. Easy ordering, very fast shipping. I use their products in all my vehicles. I also use their products in my offshore boat.

I started using amsoil 3 years ago after lots of research and found it to be the best. I use it for everything on my pickup.

I've run Amsoil in my 6.6 Duramax in screaming hot and sub zero temps with no issues at all. I intend to continue to use it.

Its a good oil but i was surprised i didnt get any stickers. When i bought it previously i got stickers

Awesome shipping time!!

I have used AMSOIL in my Ford diesel for 15 plus years and still going strong at over 444k miles!

This is the only thing I have put in my truck seance I have owned my it.

I've just now started using this oil and it seems to be a good oil. Engine sounds great and starts quickly, doesn't use a drop. Hopefully it will stand the test of time.

I love the reorder feature. Great company and product.

Quick delivery of great product for awesome price when all others are going crazy on price.

I believe that you should only use one oil for the life of your engine. Since my 2017 gmc Denali 2500 was new My first oil change I started using asm oil I never had warranty repair made on my truck. I am a ase master tech for Cadillac and shop foremen I’ve got my service write To start to using asm oil in his ats v And I use in my ats v too They are the only oil company that has spec On there oil and numerous hours for test I’m a believer yes it maybe a little more money but worth it and if Gale Banks Believe in ams oil that seals the deal with me :).

Been using amzoil for almost 15 years in my powerstroke and my cummins. Won't use anything else.

My family has used the product in 6.2 Durmax for years.

I’m really happy with the synthetic oil quality for my Duramax.

Great product Amsoil is the only oil that I have used for 18 years.

Changed from Rotella T6 to this Amsoil Signature Series. My truck seems to love it!! Seems to be running quieter and nice and smooth. Did my friends truck and the same time with the same results. Both very happy at this point!!

I use my RAM 2500 cummins for towing up and down the Sierra Nevada in the heat of southern California and in the cold of the mountain. This is the only oil i trust in my engine with all the punishment it takes. Ordering directly from amsoil is fast and easy. I do all my own services so it makes financial sense to spend the money on quality oil and filter. I only needed customer service once and they were very helpful.