Skip to Main Content
Shop by Vehicle

Customer Ratings & Reviews

AMSOIL Signature Series 5W-50 100% Synthetic Motor Oil

Product code : AMRQT-EA

5 star rating Read 6,894 reviews

Customer Rating

5

90% would recommend

  • 5 6710
  • 4 130
  • 3 24
  • 2 9
  • 1 21

AMSOIL Signature Series 5W-50 100% Synthetic Motor Oil

5 star rating Based on 6,894 reviews
  • 5 star rating
    Oil and Filter
    By  DONALD,  a  Verified Buyer  from  Windsor, On  on  September 15, 2025
    I have been using Amsoil for 5 years now in my motor home. I am 100% satisfied .
    Bottom Line
    Yes, I would recommend this to a friend.
    Was this review helpful?
  • 5 star rating
    Eco boost
    By  SCOTT,  a  Verified Buyer  on  September 15, 2025
    Helped with the eco boost cold start cam phaser rattle and making it virtually vanish.
    Bottom Line
    Yes, I would recommend this to a friend.
    Was this review helpful?
  • 5 star rating
    Best oil and customer service
    By  JOSEPH,  a  Verified Buyer  from  Illinois  on  September 15, 2025
    I have used Amsoil for years, my vehicles run fine. I would not use anything else. My last order was the first time, I have ever had a problem. Items were damaged in transit and Amsoil made it right and sent out replacement product right away.
    Bottom Line
    Yes, I would recommend this to a friend.
    Was this review helpful?
  • 5 star rating
    Best oil
    By  ROCH,  a  Verified Buyer  from  Pennsylvania   on  September 15, 2025
    I have been using Amsoil products for years. The originators of synthetic oils. They seem to always come out on top of all the testing of the other top motor oils and automotive products. I use Amsoil exclusively for all of my equipment that use oil. I am particularly fond of the signature series oil for our daily drivers.
    Bottom Line
    Yes, I would recommend this to a friend.
    Was this review helpful?
  • 5 star rating
    The Best Oil
    By  BRICE,  a  Verified Buyer  from  Ft. Myers  on  September 14, 2025
    I can tell a difference at first start up. The best I’ve ever used. I used this oil for 125k miles on my last truck. I now use it on my new one also. Thank you Amsoil
    Was this review helpful?
  • 5 star rating
    Only brand since Ram purchased new
    By  GREG,  a  Verified Buyer  from  Coppell, TX  on  September 14, 2025
    Have used Amsoil since purchasing this Ram 1500 new in 2017. No regrets and no issues with truck
    Bottom Line
    Yes, I would recommend this to a friend.
    Was this review helpful?
  • 5 star rating
    Best oil synhetic
    By  SYLVAIN,  a  Verified Buyer  from  Québec   on  September 14, 2025
    J’utilise amsoil dans tous mes véhicules
    Bottom Line
    Yes, I would recommend this to a friend.
    Was this review helpful?
  • 5 star rating
    The best you can buy
    By  GERRYL,  a  Verified Buyer  from  Melrose NM  on  September 12, 2025
    I have been using Amsoil for many years. I started using it in my motorcycle because of the way it handles the heat of an air cooled engine. Now I use it in everything I own that has a piston and a crankshaft. I use the 10w/30 signature series in my 1985 GMC K15 that I have owned for 35 years. I wouldn’t use anything else in it.
    Bottom Line
    Yes, I would recommend this to a friend.
    Was this review helpful?
  • 5 star rating
    Using this oil for many years...
    By  PETE,  a  Verified Buyer  from  NH  on  September 12, 2025
    ...since Signature Series started with 0-30, in my 03 Grand Marquis without any hiccups and lots of carefree miles knowing I've got the best protection money can buy. I've actually switched all of my other vehicles to Sig.Series oils, with the same results. Hopefully Amsoil continues to uphold their quality products until EV's are the only vehicles running the roads of our great country. Sometime after I'm gone!!!
    Bottom Line
    Yes, I would recommend this to a friend.
    Was this review helpful?
  • 5 star rating
    The best
    By  MARK,  a  Verified Buyer  from  Charlotte  on  September 11, 2025
    If you check any website, expert, etc, you will find that AMSOIL is the best oil. There is a noticeable difference in how all my cars behaved since I switched over. It’s worth the cost.
    Bottom Line
    Yes, I would recommend this to a friend.
    Was this review helpful?
  • 5 star rating
    Truck Runs Smoother
    By  ROBERT,  a  Verified Buyer  on  September 11, 2025
    The use of Signature series 5w-30 in my 2020 Ford Ranger has made a huge difference in terms acceleration; and runs smoother overall. Can’t wait to see the difference in subzero temperatures.
    Bottom Line
    Yes, I would recommend this to a friend.
    Was this review helpful?
  • 5 star rating
    Oil
    By  DENNIS,  a  Verified Buyer  from  OH  on  September 11, 2025
    Has brought my oil pressure up and has quited the engine down on start up. Haven't driven a lot of miles yet but all is good.
    Bottom Line
    Yes, I would recommend this to a friend.
    Was this review helpful?
  • 5 star rating
    Amsoil 5w 30
    By  CHARLES,  a  Verified Buyer  from  Kernersville  on  September 10, 2025
    I’m new to Amsoil and I’m hooked. The product arrived early and was packaged nicely. I’ve been checking my oil every week and the oil is much cleaner than the mobile one I used in the past. I’m switching all of my oil; transmission, front and rear differentials, over to Amsoil.
    Bottom Line
    Yes, I would recommend this to a friend.
    Was this review helpful?
  • 5 star rating
    AMS Oil Great PR and Customer Services
    By  Big E,  a  Verified Buyer  from  Laplace, La  on  September 09, 2025
    I took the recommendation of the Shop that built my engine D&A Transmission to use AMS Oil happy with the product and most of all the great experience with ordering the product thanks for being customer friendly.
    Bottom Line
    Yes, I would recommend this to a friend.
    Was this review helpful?
  • 5 star rating
    Rough Ride
    By  HOUSTON,  a  Verified Buyer  from  Texas   on  September 08, 2025
    I work in the oilfield and, if you know you know. Amsoil gives me the confidence to run these lease roads in the worst conditions. I never worry about my oil letting me down! Now my suspension, that's a different story! 🤪
    Bottom Line
    Yes, I would recommend this to a friend.
    Was this review helpful?
  • 5 star rating
    Long Time User
    By  JESSE,  a  Verified Buyer  from  Louisiana   on  September 08, 2025
    I've been using Amsoil oil and filters for years on both gas and diesel engines and they've been great. Never had a problem with shipping and I'll continue to use the best out there!
    Bottom Line
    Yes, I would recommend this to a friend.
    Was this review helpful?
  • 5 star rating
    An soul oil for the FL5
    By  JEB,  a  Verified Buyer  from  Houston  on  September 08, 2025
    Quality oil and a good price
    Bottom Line
    Yes, I would recommend this to a friend.
    Was this review helpful?
  • 5 star rating
    Toyota Camry
    By  ROBERT,  a  Verified Buyer  from  St. Augustine Florida   on  September 07, 2025
    I am using this in a 2019 Toyota Camry. It is competitively priced to the dealership and I am sure a better quality.
    Bottom Line
    Yes, I would recommend this to a friend.
    Was this review helpful?
  • 5 star rating
    Best oil, bar none!
    By  RODNEY,  a  Verified Buyer  on  September 07, 2025
    Don't mess with any other oil! It's worth the extra bucks to go with signature series!
    Bottom Line
    Yes, I would recommend this to a friend.
    Was this review helpful?
  • 5 star rating
    My Chevy Traverse runs faster
    By  RALPH,  a  Verified Buyer  from  Oregon  on  September 07, 2025
    My Chevy Traverse runs smoother and quieter. It takes off like a rocket since I put AJ’s formula in the engine. As compared to the bulk oil that the car came with, the Amsoil is far superior.
    Bottom Line
    Yes, I would recommend this to a friend.
    Was this review helpful?