Customer Ratings & Reviews

If you have a powerstroke diesel (any year) you need to run Amsoil oil along with the oil bypass system. My results from Blackstone Labs have been outstanding. We pull a 5th wheel camper and because of the heavy work that the truck does - we change our oil every 7,500 miles / 200 hours.

Noticeable difference in cranking during cold weather. Oil pressure never changes a bit when running this product.

You notice right away after you use this oil in your diesel engine. Sounds quieter and runs smoother. I combine this oil with the amsoil oil bypass filter and Dans from amsoil install kit. I take oil samples and send to amsoil agent. Oil has maintained its initial install standards. Unbelievable.

Use it in my truck. I've always used Amsoil products and have always found them to be high quality.

I use AMSOIL in all my vehicles and they operate great.

Eliminates the typewriter noise that most owners of the Lmm Duramax hear. Been using Amsoil products for years in all of my engines from motorcycles to mowers.

Once a year oil change!

Great product , does more than what it says. All fluids in trucks and dirt , street bike .

I use this product in my 2014 Silverado 2500 duramax diesel. The intervals between oil changes are phenomenal. All amsoil product lines are worth the money including this max duty diesel oil.

Great oil! All of my UTVs, farm equipment, and trucks are diesel. When in the northern sections of the country and extremely cold, there is a noticeable ease with startup vs conventional oils. I'll never go back.

Great product! Been using the diesel oil since my truck was new. Truck now has 155,000 miles and hasn't skipped a beat!

Covers my 6.7 in cold conditions

This is an outstanding product

I swear by amsoil for anything i own and always will

I use this product in a 2012 Ram with a 6.7 Cummins motor. The oil does get very dark between changes. Have not had any issues, and motor oils do get strained with diesels.

Truck really loves this oil, since I've made the switch!!

Never had a engine go down using Amsoil. Put a ton of miles on my diesel engines as well as hour's. All is good.

I have a 2007 GMC Diesel with the LMM engine and over 300,000km's. I did the first oil change and i was surprised that the particulate sensor said it was due for another change within 5000km's. I figured it was cleaning out the carbon and residue from the old oil change and changed it again. This time it went longer but still less than it should. The third change we went on a family vacation which involved towing our trailer over 6000km's. Came back and still had over 30% left. I suspect inwas right and this oil was cleaning out the deposits and gunk from my old oil. Moral of the story, if it seems to be getting dirty faster it probably is, but once it is cleans out the old seems to last longer and work better. I'll let you know in another 100,000km's or so.

I use this oil in my ecodiesel, I just recently did an oil analysis and it came back perfect. I will continue to use this great product

Truck runs quieter. Especially in cold weather.