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Customer Ratings & Reviews

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

Product code : ALMQT-EA

5 star rating Read 6,909 reviews

Customer Rating

5

90% would recommend

  • 5 6725
  • 4 130
  • 3 24
  • 2 9
  • 1 21

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

5 star rating Based on 6,909 reviews
  • 5 star rating
    Runs quiet in 5.3L L84 GM engine
    By  Proffittmarke ,  a  Verified Buyer  from  Springfield, Missouri  on  February 18, 2026
    At 140,000 miles, my engine started to be a little noisy. I bumped it up from 0W 20 to 0W 30 signature series. Runs quiet and smooth.
    Bottom Line
    Yes, I would recommend this to a friend.
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  • 5 star rating
    Love this product
    By  JONATHAN,  a  Verified Buyer  on  February 18, 2026
    I’ve been using this product for the last 12 years. It makes my engines run quieter cooler and have no issues.
    Bottom Line
    Yes, I would recommend this to a friend.
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  • 4 star rating
    Thin Oil
    By  DAVID,  a  Verified Buyer  on  February 18, 2026
    It's pricey watery oil. So far, so good.
    Bottom Line
    Yes, I would recommend this to a friend.
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  • 5 star rating
    Good
    By  JUANcho,  a  Verified Buyer  from  California   on  February 18, 2026
    Muy buenos los aceites
    Bottom Line
    Yes, I would recommend this to a friend.
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  • 5 star rating
    Best in class
    By  HUGH,  a  Verified Buyer  on  February 18, 2026
    I’ve been using Amsoil for 2 decades and never had a engine failure.
    Bottom Line
    Yes, I would recommend this to a friend.
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  • 5 star rating
    Oil
    By  ALBERT,  a  Verified Buyer  from  PA  on  February 17, 2026
    Great product, love recommending it.
    Bottom Line
    Yes, I would recommend this to a friend.
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  • 5 star rating
    Mr cheapo
    By  GREG,  a  Verified Buyer  from  Philly  on  February 16, 2026
    The original synthetic is still the best. My 2011 Focus has 3000,000 miles. Does not use any none zilch zip nadda oil. I will never use any other brand at sny price.
    Bottom Line
    Yes, I would recommend this to a friend.
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  • 5 star rating
    Good
    By  JUANcho ,  a  Verified Buyer  from  Californiana   on  February 16, 2026
    Muy bueno excelente
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  • 5 star rating
    Great product.
    By  TIM,  a  Verified Buyer  on  February 16, 2026
    Easy to read measurements on the side of the container.
    Bottom Line
    Yes, I would recommend this to a friend.
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  • 5 star rating
    Way better than OEM engine not noise at all
    By  PAUL,  a  Verified Buyer  from  Edmonton   on  February 16, 2026
    Just great oil
    Bottom Line
    Yes, I would recommend this to a friend.
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  • 5 star rating
    Gt350
    By  HICHAM,  a  Verified Buyer  from  Richmond va   on  February 15, 2026
    Good quality. Im satisfied with this oil
    Bottom Line
    Yes, I would recommend this to a friend.
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  • 5 star rating
    Great oil
    By  Steve,  a  Verified Buyer  from  Kentucky   on  February 13, 2026
    I’ve been using Amsoil for several years now. It’s not cheap, but well worth the price.
    Bottom Line
    Yes, I would recommend this to a friend.
    Was this review helpful?
  • 5 star rating
    Great product
    By  TERRY,  a  Verified Buyer  from  Manitoba Canada   on  February 13, 2026
    Amsoil has protected me for years now all my engines never had an issue. All the research I’ve done leads to amsoil being the superior product among the oil masses
    Bottom Line
    Yes, I would recommend this to a friend.
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  • 5 star rating
    Oil
    By  DMITRIY,  a  Verified Buyer  from  Ohio  on  February 12, 2026
    Awesome product Affordable Came super fast And most of all got some free stickers
    Bottom Line
    Yes, I would recommend this to a friend.
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  • 5 star rating
    Excellent Oil
    By  ALAN,  a  Verified Buyer  from  Bozeman, MT  on  February 12, 2026
    I have read about and watched many lubricant testing videos, and Amsoil always comes out in the top 3, so I believe in their products.
    Bottom Line
    Yes, I would recommend this to a friend.
    Was this review helpful?
  • 5 star rating
    Best Oil On The Planet
    By  CURTIS,  a  Verified Buyer  from  Taylor County Texas  on  February 12, 2026
    This is the best investment for you engine you can make. Do mid-cycle oil filter changes with a good filter.
    Bottom Line
    Yes, I would recommend this to a friend.
    Was this review helpful?
  • 5 star rating
    LT1 Engine Oil
    By  DANNY,  a  Verified Buyer  from  TX  on  February 11, 2026
    Quality product, and great customer service
    Bottom Line
    Yes, I would recommend this to a friend.
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  • 5 star rating
    When nothing but the best is called for.
    By  PHIL,  a  Verified Buyer  from  Earth  on  February 11, 2026
    After viewing numerous reviews comparing motor oils on YouTube. I came to the conclusion that 0W-40 Amsoil Signature was, without a doubt, the best. When you are protecting a twin turbo engine, nothing else is better than Amsoil 0W-40. Nothing.
    Bottom Line
    Yes, I would recommend this to a friend.
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  • 5 star rating
    Good oil
    By  VINCENT,  a  Verified Buyer  on  February 11, 2026
    Very good engine oil
    Bottom Line
    Yes, I would recommend this to a friend.
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  • 5 star rating
    Only oil I use now period
    By  ANTHONY,  a  Verified Buyer  from  NC  on  February 10, 2026
    Love all there products
    Bottom Line
    Yes, I would recommend this to a friend.
    Was this review helpful?

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