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

Oil is like a lot of things where the positive traits are hard to quantify. You just have to know it's good and working. I run it in a Ford 6.0 so it has to be good.

I'VE BEEN USING AMSOIL SINCE 2004 AND I JUST LOVE THESE PRODUCTS. IN MY OPINION AMSOIL IS THE BEST OIL OUT THERE NOTHING COMES EVEN CLOSE. I HAVE A 2002 TOYOTA SIENNA WITH 570.000 MILES YES YOU SAW IT RIGHT 570K MILES AND THAT THING JUST KEEPS ON GOING AND GOING, IT JUST DOESN'T WANT TO QUIT. STILL ORIGINAL ENGINE AND TRANSMISSION. PEOPLE TOLD ME TO GET RID OF IT BUT I TELL THEM IT'S NOT THE TIME YET IT STILL RUNS LIKE A CHAMP AND EVERYTHING IS WORKING ON IT. I USE AMSOIL PRODUCTS ON MY OTHER CARS AS WELL AND A FEW OF MY FRIENDS GOT HOOKED ONCE THEY TRY IT AND THEY NEVER WENT BACK TO THE OIL THEY USED TO USE. THANK YOU AMSOIL FOR YOUR GREAT PRODUCT, KEEP UP THIS AWESOME WORK AND I WISH THAT AMSOIL TO BE AROUND FOR THE NEXT 100 YEARS. BEST WISHES AND GOD BLESS AMSOIL!!!! ISTVAN.

All we use in all our truck&tractor,

I have been using this oil sense I bought my 07 Dodge Ram diesel new 12 years ago. I go 15k between oil changes. I'm glad I started using this Oil and the by-pass system when I did. I have 250k on my truck now and plan to go another 250k. Amsoil has been great every time I place an order as well.

Have been using heavy duty diesel marine synthetic motor oil in my duramax work truck for last 70,000 miles. Seems to have superior protection and less breakdown under heavy loads and extreme conditions.

Motor oil

I run this oil all winter long,every winter

I use this oil in my 7.3 liter van for the fact that it does great in the cold weather that I get into. I travel a lot in the northern states and it always turn over.

After taking professional training for oil analysis it occured to me this was a suitable option. I have a diesel truck that gets infrequent use and having a 14 tbn gives me comfort in fighting acidity while in storage.

I've got a strong running 7.3 with 292,000+ on the clock. Have been using another oil with excellent UOA reports and getting close to 10k on oil changes. Decided a while back it was time to see what this Marine Amsoil was all about. Immediately noticed my injectors were much, much quieter. Will be sending a sample in for testing in about 2000 miles and see how things compare.

Does what it says it does, went from running my oil from 5,000 miles to 20,000 miles. Saves money and time , engine temp runs cooler when under a heavy tow going up a grade, oil doesn't smell burnt when doing a change easier start up in cold whether with not having the truck plugged in. Extremely satisfied with this product!

I change oil every 15k and I think is still good. 350 ml Bluetec

Has improved the performance , better fuel economy ,easier starting saves money from not having to change oil.I also use cetane boost and injector cleaner

I feel that it is a superior product.