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

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.

Freat

I use in my 2001 F350 powerstroke on pull 35 ft 5th wheel.

15w40 AME & a 15micron Donaldson P551018 for my annual oil/filter changes. From Southern summers to Northern winters, UOA shows that this combo can't be beaten for my over fueled, compounded decathlete 12v Cummins. Don't ever stop making this outstanding CI4+ oil.

Been using since 2003 in Duramax. Handles all climates.

Switched to amsoil in my 2006 f250 powerstroke. My truck now starts much better, and runs quieter and smoother!

Only oil I've ever used in my 6.7 Cummins for last 100k aside a rotella hear and there. Also use the amsoil oil filter. Works well together !

I've run Amsoil in my 05 Cummins 5.9 for around 200k. And I've used all the different diesel oils Amsoil has to offer from highest of performance to the eco price. But In my leaky 300k plus and climbing work diesel. the marine oil always comes out with just about as much as I put in 10k ago. And the others I would sometimes be up to 3Qt short when drained. Like it's gets so thin that it finds completely new ways to seep out !! But that why I like to order the heavier oil. Lastly my whole truck runs on Amsoil rears,difs,transfer and engine, and I strongly believe that Amsoil is the soul reason why my Cummins runs as good as it does at 310k miles!! Thanks for the spectrum or synthetic lubes to chose from!! Two thumbs high from this guy!!

Amsoil heavy duty 15w-40 marine diesel oil has proven to me that it will protect my Cummins engines. I have older high mileage Dodge trucks that get driven on the highway, gravel roads in -15F cold and 100F heat and the lab results from my oil samples have continually came back great. At a minimum I put double the factory recommended mileage on this oil before changing, depending on driving conditions.

Reduced engine noise (duramax)

I've been using Amsoil diesel and marine for many years I drive 200 miles a day in my Cummins in and out of petroleum refineries 6 to 7 days a week and I work my truck hard! Amsoil has never let me down! This is a great product

I have been using Amsoil in my 2003 Chevy Duramax for its entire life with great results.

This 15w-40 Marine oil is all I use in both my 2001 300hp Mercruiser boat engines since 2011. Why you might ask? 1) Only oil that has shown to lubricate the turbo blades on my son's boat diesel super-charger. 2) When son's oil hose ruptured at full engine speed, repair mechanic stated that engine only survived due to the oil's lubrication properties.

We have been using this product in our 2004.5 Dodge diesel since 2010. The truck had 110K miles on it when we switched over and added the micro-filtration unit. We now have some 329K miles with about 120K miles of that amount while hauling commercial freight. Now back to my daily driver and still using this oil.

Product is great. 8-10,000 miles between oil changes. Price is right. You might as well go with the best.

It helps my 7.3 powerstroke start better since the injectors are oil fired it will start when 0 degrees without being plugged in