Over 200,000 miles on F-150 using this oil no issues what so ever with engine.

Have been running in 04 duramax 3/4 ton for 100,000 miles with regular oil change intervals between every 3500 to 5000 miles in a work truck that has towed heavy loads or been under stress for most of its life. Switched to synthetic amsoil at 65,000 miles in engine, plus transmission and all the boxes. Has 179,000 + miles on it now and is still running and working strong. I believe the amsoil and regular oil change intervals has made a difference in the longevity of trucks power train components.

I recommend AmsOil products all the time to friends and family. Well worth the investment.

it's a good product but I don't like the gallon jug design. They're hard to pour.

Have used this oil in my Duramax since it finally broke in at 70,000, I now have 255,000 on it and every oil test came with 50% oil life after 10,000. I do a lot of short trips along with really long trips towing.

Makes changes a snap in my duramax. The 2 1/2 gallon jug fills her to the top of the stick. Great product and easy to order too

I have used amsoil in my 2003 dodge ram 3500 the oil, performs very well has always checked good with an oil analysis 222,000 miles without ant oil related problems towing horse trailers and now a 36ft 5th wheel

Very good quality.

Boatload of additive for Excellent TBN analysis between extended oil changes.

I use this in my 98 Dodge Ram 2500HD with the 5.9L Cummins 24v engine. It's been great to the engine.

This motor oil is used in my F250 work truck. I've been using it for around 130,000 miles

Great lube. Have used in gas and diesel motorhomes

2004 Cummins 5.9 300000+ miles still has cross hatch in the cylinders

Great product. I have used this oil in this truck for 20 years. I find it runs as good as the day that I bought it.

I use this oil in my 2006 Duramax with 180,000 and my 2006 Mercruiser. Oil works great.

I use it in my Chevy gas trucks one has over 307000 miles on it never been into it 5.3L LS

Great oil, I have been running this in my 2500 4x4 dodge diesel for 10 plus years. 302,000 miles on it. Also use it in my Kubota Tractor, run it for 15,000 miles per oil change, change oil filter at 7500. I have sent the oil to lab several times, after 15,000 miles running time, oil always comes back good, never breaks down, good product,

I have gotten great results with the oil. Have gone 40,000 miles on my oil changes. And I am taking baby steps towards 100,000 miles and beyond.