By 
Yaremchuk, 
a 
Verified Buyer 
on 
October 07, 2019
Very good quality.
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5 star rating
Best for Diesels.
By 
Kenneth, 
a 
Verified Buyer 
on 
October 04, 2019
Boatload of additive for Excellent TBN analysis between extended oil changes.
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5 star rating
Great oil again!
By 
Andrew, 
a 
Verified Buyer 
on 
September 30, 2019
I use this in my 98 Dodge Ram 2500HD with the 5.9L Cummins 24v engine. It's been great to the engine.
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5 star rating
Great motor oil for my 6.0 diesel.
By 
Mike, 
a 
Verified Buyer 
on 
September 25, 2019
This motor oil is used in my F250 work truck. I've been using it for around 130,000 miles
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5 star rating
Motorhome oil
By 
Dennis, 
a 
Verified Buyer 
on 
September 23, 2019
Great lube. Have used in gas and diesel motorhomes
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5 star rating
Marine 15w40 diesel oil
By 
Joey, 
a 
Verified Buyer 
on 
September 22, 2019
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.
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5 star rating
Recommend this to all Cummins owners
By 
John, 
a 
Verified Buyer 
on 
September 22, 2019
2004 Cummins 5.9 300000+ miles still has cross hatch in the cylinders
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5 star rating
Great Oil!!!
By 
Jarrod, 
a 
Verified Buyer 
on 
September 09, 2019
I use this oil in my 2006 Duramax with 180,000 and my 2006 Mercruiser. Oil works great.
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5 star rating
Will always use this
By 
Mike, 
a 
Verified Buyer 
on 
July 17, 2019
I use it in my Chevy gas trucks one has over 307000 miles on it never been into it 5.3L LS
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5 star rating
good product.
By 
Ken, 
a 
Verified Buyer 
on 
July 16, 2019
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,
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5 star rating
Always do.
By 
Herbert, 
a 
Verified Buyer 
on 
July 04, 2019
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.
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5 star rating
Great
By 
Rob, 
a 
Verified Buyer 
on 
June 26, 2019
Freat
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5 star rating
I buy over and over again
By 
Richard, 
a 
Verified Buyer 
on 
June 22, 2019
I use in my 2001 F350 powerstroke on pull 35 ft 5th wheel.
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5 star rating
A full synthetic 15w40 CI4+
By 
Vipra, 
a 
Verified Buyer 
on 
June 12, 2019
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.
Bottom Line
Yes, I would recommend this to a friend.
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5 star rating
Will definitely only be using amsoil
By 
Easy, 
a 
Verified Buyer 
from 
North Georgia 
on 
June 03, 2019
Switched to amsoil in my 2006 f250 powerstroke. My truck now starts much better, and runs quieter and smoother!
Bottom Line
Yes, I would recommend this to a friend.
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5 star rating
Does the job !
By 
Raney1999, 
a 
Verified Buyer 
from 
North East TX 
on 
May 29, 2019
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 !
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5 star rating
Love using the diesel marine in my truck!
By 
Danny.W, 
a 
Verified Buyer 
from 
Frederick MD 
on 
May 21, 2019
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.
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