Skip to Main Content
Shop by Vehicle

Customer Ratings & Reviews

AMSOIL Signature Series 5W-20 100% Synthetic Motor Oil

Product code : ALMQT-EA

5 star rating Read 6,861 reviews

Customer Rating

5

90% would recommend

  • 5 6677
  • 4 130
  • 3 24
  • 2 9
  • 1 21

AMSOIL Signature Series 5W-20 100% Synthetic Motor Oil

5 star rating Based on 6,861 reviews
  • 5 star rating
    Oil
    By  CHRISTIAN,  a  Verified Buyer  from  South Lake Tahoe   on  October 02, 2025
    Great product helped with my Toyota Highlander death rattle at ignition. Would definitely purchase again for my next oil change. Also used the Amsoil filter
    Bottom Line
    Yes, I would recommend this to a friend.
    Was this review helpful?
  • 5 star rating
    AMSOIL signature
    By  ROBERT,  a  Verified Buyer  from  Alberta   on  October 02, 2025
    Use in my 3 vehicles for the best protection have a lot of faith in this product
    Bottom Line
    Yes, I would recommend this to a friend.
    Was this review helpful?
  • 5 star rating
    My go to
    By  Redheadengineer ,  a  Verified Buyer  from  NC  on  October 02, 2025
    Been running the soil and eco-boost engines since 2016. 2.0, 2.7 & 3.5 L in five different vehicles between my son and I. Also, in a Lexus LS series. Total mileage well over 200 K.
    Bottom Line
    Yes, I would recommend this to a friend.
    Was this review helpful?
  • 5 star rating
    100% Synthetic
    By  RICO,  a  Verified Buyer  on  October 02, 2025
    Drained old oil and changed the filter without any problem. I hope the oil lives up as advertised
    Bottom Line
    Yes, I would recommend this to a friend.
    Was this review helpful?
  • 5 star rating
    Best oil
    By  BRIAN,  a  Verified Buyer  from  Fort Wayne, IN  on  October 01, 2025
    Best stuff on the market. I have a 2019 4Runner, which can be a noisy engine. After using signature series, my engine is quieter with better mpg. Make sure to change your other fluids as well. Less friction equals better mpg
    Bottom Line
    Yes, I would recommend this to a friend.
    Was this review helpful?
  • 5 star rating
    Quality
    By  MARCO,  a  Verified Buyer  on  September 30, 2025
    I trust AMZOIL above all others in providing a top quality product!!!
    Bottom Line
    Yes, I would recommend this to a friend.
    Was this review helpful?
  • 5 star rating
    Synthetic oil
    By  KEITH,  a  Verified Buyer  on  September 29, 2025
    Excellent oil surpasses my expectations
    Bottom Line
    Yes, I would recommend this to a friend.
    Was this review helpful?
  • 5 star rating
    Motor oil
    By  Fews,  a  Verified Buyer  on  September 29, 2025
    Awesome!! Product is great saving on gas mileage already thanks..👍🏾
    Bottom Line
    Yes, I would recommend this to a friend.
    Was this review helpful?
  • 5 star rating
    Great oil
    By  MICHAEL,  a  Verified Buyer  from  Charlotte, NC  on  September 29, 2025
    I just put Amsoil Signature Series in my 2019 Ford F150 5.0 KR for the first time and seems to be running smoother and I believe my MPG is a little better. I have the gear oil being shipped now for my differential.
    Bottom Line
    Yes, I would recommend this to a friend.
    Was this review helpful?
  • 5 star rating
    Oil
    By  EUDES,  a  Verified Buyer  from  Jacksonville florida   on  September 29, 2025
    I been using this on my 23 tlx and my scat pack also on my nissan Great oil Great stuff 👌
    Bottom Line
    Yes, I would recommend this to a friend.
    Was this review helpful?
  • 5 star rating
    The only oil I ve used in over 40 years!
    By  MIKE,  a  Verified Buyer  from  Gainesville, Ga.  on  September 29, 2025
    I started using Amsoil back in the 70's (I believe I was back then). First I bought compressor oil and the compressor is still used today every day! Every carn truck, boat, compressor, motorcycles and garden machines use Amsoil! I have even proved to my friends just how great a oil it is. I sold one of my work trucks a while back that had over 386,000 miles on it, never leaked a drop and never use a drop and the oil pressure was still great. If you do regular maintenance then your equipment will last forever! Even today I just bought 2 new used year old Kia"s, one for the wife and the same one for myself and the first thing I did was to replace the oil with Amsoil 0W-20 in both of them. You can give me any other brand of oil for free and I will give it to anyone who wants it. I've been a confirmed customer for years and I will never use any other oil... I love my machines too much....
    Bottom Line
    Yes, I would recommend this to a friend.
    Was this review helpful?
  • 5 star rating
    The best!
    By  GARY M,  a  Verified Buyer  from  Flowery Branch,Ga  on  September 29, 2025
    Amsoil products far exceeds the competition. I switched from 0-20 to 5-30 for a little more protection. Engine runs quieter and smoother.
    Bottom Line
    Yes, I would recommend this to a friend.
    Was this review helpful?
  • 5 star rating
    Great oil
    By  ABRAHAM,  a  Verified Buyer  from  Batavia NY  on  September 28, 2025
    Little more than Mobile 1 but you get what you pay for.
    Bottom Line
    Yes, I would recommend this to a friend.
    Was this review helpful?
  • 5 star rating
    It’s worth it
    By  JACOB,  a  Verified Buyer  from  Van Wa  on  September 28, 2025
    LONG time Royal Purple user. Was getting low OP in my off road vehicle for some reason. Decided to test out the hype of AMSOIL, that was 5 years ago, and I have not gone back!!! Oil pressure is where it needs to be, engine runs smoother, and engine actually stays cooler!
    Bottom Line
    Yes, I would recommend this to a friend.
    Was this review helpful?
  • 5 star rating
    2015 Ford mustang gt Roush supercharger
    By  DIEGO,  a  Verified Buyer  from  California   on  September 28, 2025
    oil change is due and wanted to use a different type, I used to use 5w-40 castrol European. However, I was looking into 5w-50 from Castrol super car gt or amsoil. Did a lot of research and came to the conclusion that amsoil is the best and safest oil to use for superchargers applications. Only if you’re going to keep your car forever and track use. Once I change the oil car runs and shifts so smooth however you will still hear the clicking from the engine lol. Other than that 10 out of 10, thank you amsoil! I’m going to stick with amsoil forever and use it for my other cars and trucks!
    Bottom Line
    Yes, I would recommend this to a friend.
    Was this review helpful?
  • 5 star rating
    Best Oil Ever!
    By  Gaylord,  a  Verified Buyer  from  Fairfax, VA  on  September 28, 2025
    My 2008 4Runner just made 200k miles! Have been an Amsoil user for the last 15 yrs! To date, my car still drives like new. Thanks to Amsoil.
    Bottom Line
    Yes, I would recommend this to a friend.
    Was this review helpful?
  • 5 star rating
    0-20 syn oil
    By  NICK,  a  Verified Buyer  from  Colorado  on  September 28, 2025
    Excellent product
    Bottom Line
    Yes, I would recommend this to a friend.
    Was this review helpful?
  • 5 star rating
    Great productt
    By  Paycut,  a  Verified Buyer  from  South Carolina  on  September 26, 2025
    AMSOIL came highly recommended so I wanted to start right off on our new Tundra. Ordering was easy, quick delivery. Fair price. Will continue ordering online and using
    Bottom Line
    Yes, I would recommend this to a friend.
    Was this review helpful?
  • 5 star rating
    Best Oil for 2.0 Jeep Motor
    By  HERBERT,  a  Verified Buyer  from  Lake Charles  on  September 26, 2025
    This oil was recommended to me by some fellow Jeep Wrangler 2.0 Turbo owners. These 2.0 Turbo engines have a slight rattling/knocking noise somewhat like a diesel engine sound with normal oil. These Amsoil Oil quiets the engine and now it sounds like a normal gas engine. Jeep started using the 2.0 back in 2018. Some of the friends of mine have over 100K miles without any problems using the Amsoil. I’m sold.
    Bottom Line
    Yes, I would recommend this to a friend.
    Was this review helpful?
  • 5 star rating
    Great oil for the Jeep 3.6
    By  MICHAEL,  a  Verified Buyer  from  NewYork  on  September 26, 2025
    The Jeep 3.6 valve train noise is totally gone! I have tried many different brands of oil, but the valve train noise always comes back in a day or two after oil change, AMSOIL is definitely far far more effective.. Cam and lobes along with rocker arms all look new..
    Bottom Line
    Yes, I would recommend this to a friend.
    Was this review helpful?