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AMSOIL Signature Series 5W-30 100% Synthetic Max-Duty Diesel Oil

Product code : DHDQT-EA

4.9 star rating Read 1,207 reviews

Customer Rating

4.9

91% would recommend

  • 5 1152
  • 4 41
  • 3 5
  • 2 3
  • 1 6

AMSOIL Signature Series 5W-30 100% Synthetic Max-Duty Diesel Oil

4.9 star rating Based on 1,207 reviews
  • 5 star rating
    2006 Duramax
    By  RAY,  a  Verified Buyer  on  May 11, 2024
    I used the in my 2006 Duramax since it was new! I have 500,000 KLMs on it now and never had any issues with this engine!!
    Bottom Line
    Yes, I would recommend this to a friend.
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  • 5 star rating
    diesel oil
    By  DAVID,  a  Verified Buyer  from  chicago  on  May 10, 2024
    the best oil you can buy.
    Bottom Line
    Yes, I would recommend this to a friend.
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  • 5 star rating
    Great oil super price
    By  TONY,  a  Verified Buyer  on  May 05, 2024
    Love this oil. 6.7 power stroke with 95,000 miles It’s the only oil that’s been used since new
    Bottom Line
    Yes, I would recommend this to a friend.
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  • 5 star rating
    Max duty oil
    By  Scott,  a  Verified Buyer  from  AZ  on  May 01, 2024
    This is the best oil that you can get. You can see how well it's held up during oil changes. It's the only thing I'll ever use in my super duty.
    Bottom Line
    Yes, I would recommend this to a friend.
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  • 5 star rating
    Bad reward good oil
    By  ADAM,  a  Verified Buyer  from  Utah  on  April 29, 2024
    I exclusively use Amsoil on all my vehicles and toys. The only negative I have is with the rewards. Why aren’t they just built in? I always get an email saying free this or free that but never remember what the code is. Why not just include it?
    Bottom Line
    Yes, I would recommend this to a friend.
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  • 5 star rating
    Great Product
    By  JASON,  a  Verified Buyer  from  Indianapolis  on  April 29, 2024
    Using it on my 2015 Ram Ecodiesel, It immediately quieted and smoothed out the engine. I'm at 125k miles and no issues. I will continue to send in my oil evaluations for testing and hope to see this truck live a long and happy life. Looking to do my transmission next to prolong longevity and performance. Thank you Amsoil for a great product and for making kits specific to my vehicle, it takes the guess work out of it. Thank you,
    Bottom Line
    Yes, I would recommend this to a friend.
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  • 5 star rating
    The best
    By  HAROLD,  a  Verified Buyer  from  New Albany Indiana   on  April 27, 2024
    I was driving over 4000 miles a week and only used Amsoil. The only oil that would hold up.
    Bottom Line
    Yes, I would recommend this to a friend.
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  • 5 star rating
    Savings
    By  MICHAEL,  a  Verified Buyer  from  Malone New York   on  April 25, 2024
    Do the math, after switching to 6x, I haven't had to add a single drop in over 10000 miles, and I only put on 10-15k a year.vs the previous where it was about a gallon a month. Still looks good after a year, love it!
    Bottom Line
    Yes, I would recommend this to a friend.
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  • 5 star rating
    Best Oil for My Semi
    By  ARTHUR,  a  Verified Buyer  on  April 23, 2024
    My semi runs awesome on this oil
    Bottom Line
    Yes, I would recommend this to a friend.
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  • 5 star rating
    Diesel oil.
    By  DERRICK,  a  Verified Buyer  on  April 20, 2024
    Always liked AMSOIL ever since I first started using it racing motocross. Now run it in all my equipment. Switching my tractor to it next.
    Bottom Line
    Yes, I would recommend this to a friend.
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  • 5 star rating
    Like Magic!
    By  BILL,  a  Verified Buyer  from  Monticello FL  on  April 19, 2024
    I used this hydraulic oil for my 50 hour service on my Kioti CK 4020. Amazing! The hydraulic controls work much smoother and the whole machine is much quieter! Highly recommend!
    Bottom Line
    Yes, I would recommend this to a friend.
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  • 5 star rating
    Best oil on the market
    By  JOSEPH,  a  Verified Buyer  from  S.W. Missouri   on  April 16, 2024
    Best you can buy. Can't beat it. I use Amsoil in all 4 vehicles and always will.
    Bottom Line
    Yes, I would recommend this to a friend.
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  • 5 star rating
    Great stuff
    By  JEFF,  a  Verified Buyer  from  Idaho  on  April 16, 2024
    I was introduced to Amsoil and there products and glad so far I made the switch from Mobile. Will see how it it goes when I pull the 5th wheel RV next week.
    Bottom Line
    Yes, I would recommend this to a friend.
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  • 5 star rating
    Extreme duty
    By  CHRIS,  a  Verified Buyer  from  Roosevelt Utah  on  April 13, 2024
    Oil field, off road, 129,000 lbs, and on road grades up to 8%, off road grades up to 16%, pulling a super set of 108’ in combination length. The truck is a 2019 Peterbilt 389 with a 565 x15 Cummins, 18spd manual, 3:90 rear ends and lockers inside 23,000 lb housings. To date, the engine oil has been replaced with the 15w40 signature series as well as the Amsoil bypass system. The engine coolant has also been replaced with the Amsoil 1,000,000 mile coolant and the differential fluids have also been changed to the Amsoil Severe gear 100% synthetic 75w140. Under these extreme conditions, these Amsoil products are providing exceptional performance and durability. My truck is not building heat from friction caused by wear. The other drivers I work with are already complaining about their trucks building heat from the coolant temperatures to engine oil temperatures to differential temperatures. I have no such complaints. These products are truly the BEST in synthetics. Thanks Amsoil for keeping my truck on and off road and out of the shops
    Bottom Line
    Yes, I would recommend this to a friend.
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  • 5 star rating
    AMSOIL Signature Series 0W-40 100% Synthetic Max-Duty Diesel
    By  Eugene,  a  Verified Buyer  from  Brooklyn, NY  on  April 11, 2024
    Winter time mixing with other AMS oils. Working very good.
    Bottom Line
    Yes, I would recommend this to a friend.
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  • 5 star rating
    Quality oil.
    By  MARK,  a  Verified Buyer  from  Massachusetts  on  April 11, 2024
    I like the data backed science behind the amsoil products. I have had my amsoil analyzed by independent third party companies after various mileage intervals (5k, 10k and 20k+) and the oil still had good lubrication characteristics (tbn) at even 20k+ miles.
    Bottom Line
    Yes, I would recommend this to a friend.
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  • 5 star rating
    Best in its class
    By  TRACY,  a  Verified Buyer  from  Clarksville   on  April 09, 2024
    Can’t beat this stuff I run it in my F350
    Bottom Line
    Yes, I would recommend this to a friend.
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  • 5 star rating
    Oil change
    By  NICK,  a  Verified Buyer  from  Key largo   on  April 09, 2024
    Smooth and easy Send my promotional product. That I asked for 3 times... Let's see if I get a response.
    Bottom Line
    Yes, I would recommend this to a friend.
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  • 5 star rating
    Great Quality
    By  SOLOMON,  a  Verified Buyer  on  April 08, 2024
    Good oil buy it
    Bottom Line
    Yes, I would recommend this to a friend.
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  • 5 star rating
    Better cold weather cranking
    By  DAVE,  a  Verified Buyer  from  Idaho  on  March 31, 2024
    Much better starting in the morning on cold winter days. I don’t drive it very often now so I change the oil only once a year with this oil. That’s less than 5000 miles.
    Bottom Line
    Yes, I would recommend this to a friend.
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