Product Reviewed: Premium Diesel Oils (DEO,DME)
Current Rating: 4.87 out of 5 stars
Votes & Reviews: 204 vote(s) and 332 user reviews.
Reviewed by CDP: 
Been running this oil for 50,xxx miles + and zero issues.
Reviewed by Robby:
It is the best oil for the price.
Reviewed by Av:
I have used Amsoil in all my vehicles for 25+ years now.
You simply can not get better oil.
Reviewed by Dmax:
This product is an excellent product I am very satisfied in the performance that it has given me
Reviewed by N/a:
Use amsoil in all three of my vehicles.
Reviewed by
Tank:
I like this oil it is great!
Reviewed by Sparky413:
Great oil !!!! Lower evaporation than all others I've tried
Reviewed by Happy Camper:
I have run your oil and your bypass filter system over 200,000 miles while towing a 10,000 pound travel trailer most of those miles.
I have had zero problems during that time.
I change the oil one time per year, the bypass filter one time per year, and the full flow filter two times per year, while putting about 20,000 to 25,000 miles on the truck. This
takes all the hassle out of oil changing, and no problems. I had the oil analyzed for 5 years, and never received a result that indicated the oil needed changing at the end of the year.
Reviewed by The big Beano:
I change my oil every 8 to 10 thousand miles with a 2 quart micron bypass filter. I added myself very easy with kit 215000 miles and never lost a fuel injector, of course bullet-proofed it no problems love it
Reviewed by Scout:
this is a superior oil to other diesel oils but at least on a 5.9l cummins the oil gets way to thick from the soot at around 5000 miles, I would not recommend going past that interval, I am using the amsoil filter as well.
My 7.3 power stroke takes 15W40 and goes 20k miles before getting that bad.
This oil doesn't stand up to the amount of soot produced in 5.9
cummins in my experience which is why I give it 4 stars
Reviewed by Rowdy:
Great product.! Amsoil saves me money.!
I get many miles before oil changes. This product will extend the life of my vehicles.!
Reviewed by Tom:
smooth running .
Reviewed by Bob:
I rely on the product being able to go the distance or time frame without worrying about going a little longer because of not having the time to change it . I have total trust in the product. I have had better mileage results with this oil also.
Reviewed by DK:
I have used AMSOIL products for 30 plus years. That should say how I like their products
Reviewed by AHA:
Love the product. No complaints
Reviewed by Mad Dog:
The knowledge that you've used the best product for the job equals many happy, trouble free miles.
Reviewed by Mister Cedric:
Very pleased with the Amsoil product line. Great performance and this oil is quite honestly the best for my diesel equipment
Reviewed by None:
Good oil
Reviewed by Diesel Power:
I use Amsoil in all my equipment (several are diesel powered), I'm very happy with their product and I've used it for years.
Reviewed by Greg in Oswego:
I use this because it is the best that's available. I little more money for peace of mind. In the future I also plan on adding secondary filter and relocation kit.
Reviewed by Roger:
I have used this in my 07 GMC Sierra , I bought the truck with 8000 Miles on it. I have 240000 now,. 6.6 turbo diesel. I changed the oil every 12 -15 thousand miles , I'm a quart low at 12 thousand miles.
Reviewed by Diesel Lover:
If you have a powerstroke diesel (any year) you need to run Amsoil oil along with the oil bypass system. My results from Blackstone Labs have been outstanding. We pull a 5th wheel camper and because of the heavy work that the truck does - we change our oil every 7,500 miles / 200 hours.
Reviewed by D man:
Great
Reviewed by Db:
Noticeable difference in cranking during cold weather. Oil pressure never changes a bit when running this product.
Reviewed by Angus:
You notice right away after you use this oil in your diesel engine. Sounds quieter and runs smoother. I combine this oil with the amsoil oil bypass filter and Dans from amsoil install kit. I take oil samples and send to amsoil agent. Oil has maintained its initial install standards. Unbelievable.
Reviewed by JacksonRabbit:
I am using this oil in a low mile Chevy Silverado HD with diesel engine. I haven't had any issues, but with the low mileage, its too early to give a more detailed review.
Reviewed by JB:
Use it in my truck.
I've always used Amsoil products and have always found them to be high quality.
Reviewed by Mark M:
I use AMSOIL in all my vehicles and they operate great.
Reviewed by Joe:
Eliminates the typewriter noise that most owners of the Lmm Duramax hear. Been using Amsoil products for years in all of my engines from motorcycles to mowers.
Reviewed by bikeman41:
Once a year oil change!
Reviewed by Dirty dave:
Great product , does more than what it says. All fluids in trucks and dirt , street bike .
Reviewed by Hand Cannon:
Amsoil is legendary synthetic oil. I purchased the Amsoil dual bypass oil filter and wanted to compliment the protection for my vehicle by adding the best synthetic oil available. After doing my research, I feel as though I am providing the ultimate protection for my truck. I am no mechanic, however, truck runs excellent and I am pleased with my purchase. Extended mileage oil change is a big plus.
Reviewed by Drivr51:
I use this product in my 2014 Silverado 2500 duramax diesel. The intervals between oil changes are phenomenal. All amsoil product lines are worth the money including this max duty diesel oil.
Reviewed by JG:
Great oil! All of my UTVs, farm equipment, and trucks are diesel. When in the northern sections of the country and extremely cold, there is a noticeable ease with startup vs conventional oils. I'll never go back.
Reviewed by Audie Baca:
Great product! Been using the diesel oil since my truck was new. Truck now has 155,000 miles and hasn't skipped a beat!
Reviewed by Rocketman:
I have all confindence in Amsoil products and will use them always.
Reviewed by Sixpack:
Covers my 6.7 in cold conditions
Reviewed by Pj:
This is an outstanding product
Reviewed by Seabass:
I swear by amsoil for anything i own and always will
Reviewed by Mark:
I use this product in a 2012 Ram with a 6.7
Cummins motor. The oil does get very dark between changes.
Have not had any issues, and motor oils do get strained with diesels.
Reviewed by Chumleyy:
Truck really loves this oil, since I've made the switch!!
Reviewed by Rusty:
Never had a engine go down using Amsoil. Put a ton of miles on my diesel engines as well as hour's. All is good.
Reviewed by Cecil:
This is the only oil I will ever use.
Reviewed by Brad:
I have a 2007 GMC Diesel with the LMM engine and over 300,000km's. I did the first oil change and i was surprised that the particulate sensor said it was due for another change within 5000km's. I figured it was cleaning out the carbon and residue from the old oil change and changed it again. This time it went longer but still less than it should. The third change we went on a family vacation which involved towing our trailer over 6000km's. Came back and still had over 30% left. I suspect inwas right and this oil was cleaning out the deposits and gunk from my old oil. Moral of the story, if it seems to be getting dirty faster it probably is, but once it is cleans out the old seems to last longer and work better. I'll let you know in another 100,000km's or so.
Reviewed by Andy:
I use this oil in my ecodiesel, I just recently did an oil analysis and it came back perfect. I will continue to use this great product
Reviewed by Mike:
Truck runs quieter. Especially in cold weather.
Reviewed by Dave:
I change my oil once a year his oil allows me up to 25,000 miles before I have to change.
Reviewed by Tak:
I run Ams oil in my truck, SUV and motor cycle .It costs a little more but to me it's worth the extra cost.. I tend to push my oil changes a little longer so I just use what I think is the best.
Reviewed by Dieseldog:
I will always use Amsoil in any vehicle that's worth anything to me!
Currently driving a Cummins and the difference is extremely noticeable!!!
Power increase, less noise, just about eliminated my oil loss and seems to have even improved my fuel economy. It's like liquid gold for my engine!
Reviewed by Bobby:
I purchased the signature series diesel oil and filter and after 6,000 miles, I decided to send my sample to a third party for testing. The report came back stating my oil and engine health was one of the best they've seen for an engine with over 200,000 miles.
Reviewed by Will:
I use this product in my pick up that has a Duramax and it with 187,000 miles
Reviewed by Brian:
Amsoil is a very good oil for my echo diesel dodge truck. I have used Ams for years and I am sold on the product.
Reviewed by Yelly:
We have used amsoil on our farm and if it holds up there it can hold up to any thing! I won't use any thing but amsoil products in every thing I own!
Reviewed by red:
great product
Reviewed by Dan:
I have nine diesels on the ranch and use Max-Duty in all of them including a few gasoline engines. Works like I expect it to work.
Reviewed by Rick:
Use this in my 12v Cummins was adding about a half a quart of oil every 1000 miles before switching to to this oil now it's about a half a quart every 4000 miles and I change it every 5k.
Reviewed by Dirtman:
if you want the best protection for your engine buy amsoil. I use it in everything so my equipment will last.
Reviewed by Friedrich:
Hands down the best oil out there i have tested my oil after it comes out and still have amazing tbn numbers in ty he 5 range with 7000 miles on that oil
Reviewed by Andy:
Switched my 2015 powerstroke over to this when it hit 20k miles. Now at 135k and zero problems. When it says "change oil soon" I go online and order it, 2-3 days later it is here. Wish there was a better price break on the gallon jugs rather than having to pour in 13 individual quarts as it is cheaper by the case.
Reviewed by John:
When I ordered my duramax in 08 I wanted to run the best oil and fluids because I don't plan on buying another 65,000 truck. I researched extensively and found the decision easy. Everything but the radiator has amsol. I'm at 320,000 problem free miles. With the exception of the headlights that regularly burn out, I haven't had one single issue with my truck. I bought a 24' triton boat with a 300 yamaha and the day my warranty ran out it also got refilled with amsol marine oil. .
Reviewed by navret02:
Was introduced to this oil and it really works. Protecting my 6.0 Diesel Engine under any load, especially with the Bypass oil system!
Reviewed by Bob:
The total Base number is way too low for my liking since they changed the formulation. I am switching brands of oil.
Reviewed by Gene:
I like the way it keeps my engine clean and running free.
Reviewed by charlie:
well this is the best oil ive ever used on my diesels lol I tried out the amsoil in a way that most peoples wont ever or even try to see how long it actually lasts before it completely breaks down ,, soo what I did was I just kept changing the oil filter every 12 thousand miles until it finally broke completey down lol I made 43,768 miles and that where it actually just burned out but all and all its the best in the world !!!!
Reviewed by Carlos:
I have been using Amsoil since 2009.
Reviewed by Pete:
I have tried every kind of synthetic for a diesel engine and found AMSOIL to be the best by far. I have a E350 Ford van with a 7.3 power stroke engine. I have gained two miles per gallon and the motor runs smooth.
Reviewed by Kevin:
First 10K was great, pushing this last oil change to 25K will update review after my oil analysis is done.
Reviewed by Don M:
Primary use is for my Cummins 6.7 in my 2014 Dodge Ram. We use the truck for towing and I feel that Amsoil Signature series helps protect my truck in severe duty towing.
Reviewed by Austin the concrete pumper:
Well, the reality is... Diesel maintenance is expensive, no two ways about it.
With this
oil I can run longer intervals with less deterioration and degradation, even on the heui engines I own and maintain (which works oil to the max)
I have to say, with the oil analysis that I get back consistently telling me that my engines are happy to run extended change intervals ((while still changing filters at normal intervals)) I'm a happy camper, over the next ten years I'll save tons of money.. tell me that wouldnt make you happy.
Reviewed by Casey:
I use this product in my Ford F250 6.0L PSD. I noticed my turbo spooling up easier and quicker after switching from conventional oil. The 6.0L PSD's are very tough on the oil due to the high shearing of the oil pressure run fuel system and the lubrication of a hot turbo. Many professionals highly recommend changing at 6000 miles in the 6.0 PSD. I run my diesel kind of hard with pulling a lot of heavy loads and running a hot tune for daily driving and playing around, my last oil change was at 9000 miles. Oil was still full without adding any, still feels more slippery than new conventional. I reuse it in old oil burning engines and it cuts the oil consumption in half. A relative of mine has been using my drained Amsoil in their beater car for over a year and it cut way down on the oil consumption. I would run the oil longer in my 6.0, but like to recycle it into the older engines. I use only the Amsoil long life oil filter. I may purchase the oil test kit in the future just to see if there is any depletion in the strength of the oil, but I am very happy with my use of this product.
Reviewed by Ryan:
So glad I've switched to Amsoil products! I want nothing but the best going in to my engines. Outlasts any lubricant I've ever used in my vehicles.
Reviewed by AA RON:
Amsoil synthetic keeps my work truck running and me making money. The only way to go.
Reviewed by MR G:
My cummins runs so much smoother
Reviewed by None:
Best oil made
Reviewed by Robin:
I trust this product compact to what we getting out there it is proven to have the correct antiwear detergents blend into the oil and you can listen to the effectiveness and quieter motor when idle and driving at your cruse speed
Reviewed by SD:
I use this on my 2018, Super Duty 250
Reviewed by Hawk:
The best oil product I've ever used.
Reviewed by STW:
GOOD STUFF
Reviewed by Matt the Hunter:
I use this in my Daily Diesel Truck,I love the power it frees up.
Reviewed by Bigb:
200k on my cummins diesel with amsoil.still like new.great stuff.
Reviewed by Jr:
Use this oil on 17 duramax works great glad i can get quality oil shipped to my door gives me peace of mind my truck has the protection it needs to do its job
Reviewed by Ink:
Upon purchase of a new Toyota the service rep recommended Amsoil. I use Amsoil in a 2014 Tundra, a John Deere 748 Diesel, a 2017 Camry, a 2014 Outback, a 2016 Highlander, and a Honda lawnmower. Well satisfied at this time.
Reviewed by J-Rod:
This diesel oil is the best stuff out there! I use everything AMSOIL!
Reviewed by MB:
Amsoil products fit the bill for almost any application @ a affordable price.
There products are vastly superior to most on shelf products, They even make
specific products for specific needs. all this with great tech support and easy online
purchasing. I will continue using Amsoil products for these reasons.
Thank you Amsoil.
Reviewed by Eddie:
Great stuff. I've been running this stuff for years. About 15,000 miles per change. I know several people that have ran it the full 25,000 miles.
Reviewed by Perez:
I have an 05 6.6 duramax and like that this oil gives me more miles between oil changes.
Reviewed by Gus:
So far so good, like to put 15w 40 synthetic on my Cummins. Lets see next oil analisis how's holding up.
Reviewed by Mike:
I've been using Amsoil in my 04 Ram 5.9 L Cummins almost since it was new. 280,000 miles and no engine problems at all!
Love it!
Reviewed by Jarvis:
Solid premium product. I try to take care of my vehicles the same way I do my body. I look for the full protection of the lubrication this product provides in the rigorous operations I put my truck through, and the many miles I do. I'm happy with it.
Reviewed by Steve the boss:
Have used the diesel oil in my Ram from Day one. I believe it's the best on the market. I trust it.
Reviewed by Chad:
Changed all the fluids in my 99 Superduty(220000 miles) over to Amsoil products. Truck starts easier in cold weather trans temps have dropped 10-15 degrees towing and I gained 2 MPG.
Reviewed by Wild Bill:
Used in my 2014 Ram 1500 Eco Diesel
Reviewed by Pdnh:
Was using Mobil Delvac 1. Would change oil at 15000 miles, changing the filter at 7500. Doing oil analysis at 15000 miles the oil was at 70%. Switching to Amsoil I change at 25000 changing the filter at 12500 the oil is just a little over 80%. Results speak for themselves.
Reviewed by Justo:
I am using the amsoil for the last five years
About 100,000 and 120,000 miles per years
My semi truck and me we are happy and saving money it's amazing for the best
Reviewed by Jemeda11:
In my diesel trucks. Awesome oil. Lasts 25000km before I even think of changing it.
Reviewed by Vegadriver:
Run this oil in my 2012 Duramax. Can go a full year without oil change. Saves me money. Also use the Amsoil filter.
Reviewed by JasonV:
Love it.
Good quality oil for a good price for this quality oil.
Will Definitely buy again as its cheaper to do it my self than having the dealer do it and I get a way better oil for my truck.
Reviewed by NYMustang50:
Stuff is worth every penny. Oil analysis test prove it. Always use Amsoil in all my personal engines.
Reviewed by PAPPY:
ALSO IN MY SS2 CAMARO
Canada
United States
Another great product!
On my last oil change, I switched to the 15W-40 Signature series Max-Duty synthetic Diesel oil. I had been running the 15W-40 Heavy duty Diesel and Marine oil since 2008 with excellent results, so when this one came out I figured why not give it a try. So far, the oil has performed exceedingly well. Engine runs cool, smooth and quiet. I own a 2006 Silverado 2500HD LBZ Duramax which is aproaching 400,000 miles and it's still running great. Oil change intervals have averaged between 12000 - 18000 miles for the life of the truck. I still don't even need to add any oil between changes. I run Amsoil lubricants throughout the whole truck.