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

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.

Overall great oil

best stuff on the market use it in my truck and both my Harleys

When you ante up $10K for the industries most powerful diesel you want to take steps to ensure it is well kept. Have been using thee Signature Oil with the Amsoil by-pass system. Have been happy with the results. Highly recommended.

So, it was time to change the oil in my John Deere 2025r. Being a Amsoil PC I decided to try Amsoil in my tractor. I used Amsoil Engine Flush before pulling the plug and after draining my oil I'm glad I did! My oil was full of soot and carbon! After installing my Amsoil filter ( got the filter recommendation from Amsoil Tech.) I added some fresh Amsoil 5w-40 and started my JD up. I've never heard it run so quite! Almost sounded like a gas engine it was so quite! Looking forward to seeing if I can ' feel the protection' when I use it !! Thanks Amsoil!

I used this oil for years in my truck and my cars. Best oil by any circumstances

I have been using this oil the truck has over 200 thousand miles and going strong I change it once a year and I also a change the filter at 6 months intervals

Love this oil for my Duramax diesel. Just made a 3,000 mile trip and didn’t have to add any. Love the wide mouth of the quart container as it pours really fast

Superior product.