About this item

• Product Overview

  AMSOIL 5W-30 100% Synthetic Small-Engine Oil
  Delivers commercial-grade protection and outperforms conventional oils. Tough formulation protects against wear, heat and carbon deposits. Helps maintain power and promotes long engine life. Specifically designed for maximum equipment dependability. Service life up to 200 hours.

  See the product data sheet for full details.

  EXCELLENT WEAR PROTECTION

  • Shear-stable, high-film-strength formulation fortified with anti-wear additives.
  • Does not thin out due to mechanical shear, ensuring a thick lubricating film for maximum wear protection.
  • Specialized chemistry forms a durable barrier that protects against metal-to-metal contact.

  REDUCES OIL CONSUMPTION

  • Reduced oil consumption 61% in lab testing compared to three leading 10W-30/SAE 30 motor oils.¹
  • Heat-resistant synthetic base oils provide low volatility, excellent viscosity stability and strong oxidation resistance.
  • Helps engines run longer between top-offs, providing peace of mind they won’t fail due to oil starvation and will run dependably in the harshest conditions.

  FORMULATED FOR POWER

  • Prevents ring and valve sticking while helping eliminate carbon deposits..
  • Reduces piston-ring and cylinder wear for maximum engine compression.
  • Helps produce maximum power throughout their service lives, helping you get more work done.

  See the product data sheet for full details.

  ¹Based on 125-hour lab tests of small engines using AMSOIL 10W-30 Synthetic Small-Engine Oil and three leading 10W-30/SAE 30 motor oils.

• Technical Specifications

  Data Bulletin

  Data Bulletins

  Warranty

  WARRANTY

  SDS

  SDS (English)

  SDS (French)

  
  
  

• Product Reviews

  5 star rating

  Based on 519 reviews

  Based on 519 reviews

  See all customer reviews

  Sort by

  Most Recent Most Helpful Highest Rating Lowest Rating Oldest

  • 5 star rating
    Good for power generators
    By  RAMSES,  a  Verified Buyer  from  Chicago  on  October 25, 2026

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    Much better choice than using engine oil, generator runs quieter.
    Bottom Line

    Yes, I would recommend this to a friend.
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  • 5 star rating
    Simplifying my life.
    By  PAUL,  a  Verified Buyer  from  Green Bay  on  October 23, 2026

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    I have been and are currently using the Commmercial Grade 10w40 in all of my outdoor equipment ( with the exception of the snowblowers ) for quite some time now. I've noticed the engines run cooler and the oil seems cleaner ( I change at 100 hour intervals ) .No more dealing with the different weight and viscocity oils again. I run full synthetic in everything I own. I wont be going back to regular oil again.
    Bottom Line

    Yes, I would recommend this to a friend.
    Was this review helpful?

    YES (0) NO (0)
  • 5 star rating
    Full synthetic
    By  KARL,  a  Verified Buyer  from  Pennsylvania   on  October 18, 2026

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    My lawnmower loves it
    Bottom Line

    Yes, I would recommend this to a friend.
    Was this review helpful?

    YES (1) NO (0)
  • 5 star rating
    Running good
    By  DAVE,  a  Verified Buyer  from  IND   on  October 01, 2026

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    Engines running cooler and smoother
    Bottom Line

    Yes, I would recommend this to a friend.
    Was this review helpful?

    YES (1) NO (0)
  • 5 star rating
    Excellent generator engine oil
    By  Ago,  a  Verified Buyer  from  New Jersey  on  September 27, 2026

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    I only replace my generator oil with AmsOil Small Engine Oil, it keeps the engine running smooth and since it’s always running at full throttle it ensures that I minimize engine wear.
    Bottom Line

    Yes, I would recommend this to a friend.
    Was this review helpful?

    YES (2) NO (0)
  • 5 star rating
    Using for purpose needed is key
    By  MIKE,  a  Verified Buyer  from  The Villages Florida  on  September 25, 2026

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    In the villages, a great way to get around is by golf cart. Purpose-built roads. I don't golf, but I do drive a ton of hours on my golf cart. I have used all kinds of different oils, all high-end stuff, not off-the-shelf stuff. My problem has been this. I realized that just because it is a great oil it depends on application. All the oils I used in my cart were for automotive purposes. This cart is a one-cylinder air cooled and splash lubricated. No oil filter. I was having fuel dilution issues, so after trying several oils, I wound up at Amzoil and tried their race go-kart oil or the Briggs and Stratton race oil, and that was great, but it's not meant for long use. Basically, a practice in your go-kart and race, then drain the oil. So it doesn't last. Also not built for my application. Then I tried the Small Engine Oil and perfection. WHAT A DIFFERANCE! Same performance as the race oil but doesn't break down fast. This is why they say use the correct oil for what you need for the engine that you have. Now can I run regular automotive oil in my golf cart? Sure, but it's really not for Golf Carts. Yamaha uses a mineral-based, non-synthetic oil. But the cart didn't run as good. This Small Engine Oil works great; it runs just as good as the Racing oil, and my golf cart has never run better. Now I can get more longevity out of the oil.
    Was this review helpful?

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  • 5 star rating
    Full synthetic
    By  KARL,  a  Verified Buyer  from  Pennsylvania   on  September 20, 2026

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    The lawnmower likes it
    Bottom Line

    Yes, I would recommend this to a friend.
    Was this review helpful?

    YES (1) NO (0)
  • 5 star rating
    Works great in my 4K rv generator
    By  JAMES,  a  Verified Buyer  on  September 19, 2026

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    Good product
    Bottom Line

    Yes, I would recommend this to a friend.
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  • 5 star rating
    The best
    By  TERENCE,  a  Verified Buyer  from  Amherst NY  on  September 18, 2026

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    The only Oil I use in my Ariens snow blower. I had issues with other oils and I will just leave it at that. Absolutely no issues after using this. Was not a coincidence this oil performs
    Bottom Line

    Yes, I would recommend this to a friend.
    Was this review helpful?

    YES (1) NO (0)
  • 5 star rating
    10w30 lawn mower oil
    By  DALE,  a  Verified Buyer  from  Picton Ontario   on  August 21, 2026

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    Engines run smoothly in all my mowers. Does not break down in hot weather!
    Bottom Line

    Yes, I would recommend this to a friend.
    Was this review helpful?

    YES (4) NO (0)

• Highlights

  • Protects up to 200 hours
  • Helps extend engine life
  • Rust-inhibited
  • Maximizes engine power
  • Helps cut maintenance costs

• Returns

  We offer easy returns for customers. If your product is unused and unopened, you may return it within 30 days for a full refund of the purchase price. View full AMSOIL Return Policy.

• Payments

  We accept Visa, Mastercard, American Express, Discover and PayPal, and provide secure checkout and encrypted payment processing.

• Product Overview

  AMSOIL 5W-30 100% Synthetic Small-Engine Oil
  Delivers commercial-grade protection and outperforms conventional oils. Tough formulation protects against wear, heat and carbon deposits. Helps maintain power and promotes long engine life. Specifically designed for maximum equipment dependability. Service life up to 200 hours.

  See the product data sheet for full details.

  EXCELLENT WEAR PROTECTION

  • Shear-stable, high-film-strength formulation fortified with anti-wear additives.
  • Does not thin out due to mechanical shear, ensuring a thick lubricating film for maximum wear protection.
  • Specialized chemistry forms a durable barrier that protects against metal-to-metal contact.

  REDUCES OIL CONSUMPTION

  • Reduced oil consumption 61% in lab testing compared to three leading 10W-30/SAE 30 motor oils.¹
  • Heat-resistant synthetic base oils provide low volatility, excellent viscosity stability and strong oxidation resistance.
  • Helps engines run longer between top-offs, providing peace of mind they won’t fail due to oil starvation and will run dependably in the harshest conditions.

  FORMULATED FOR POWER

  • Prevents ring and valve sticking while helping eliminate carbon deposits..
  • Reduces piston-ring and cylinder wear for maximum engine compression.
  • Helps produce maximum power throughout their service lives, helping you get more work done.

  See the product data sheet for full details.

  ¹Based on 125-hour lab tests of small engines using AMSOIL 10W-30 Synthetic Small-Engine Oil and three leading 10W-30/SAE 30 motor oils.

• Technical Specifications

  Data Bulletin

  Data Bulletins

  Warranty

  WARRANTY

  SDS

  SDS (English)

  SDS (French)

  
  
  

• Product Reviews

  5 star rating

  Based on 519 reviews

  Based on 519 reviews

  See all customer reviews

  Sort by

  Most Recent Most Helpful Highest Rating Lowest Rating Oldest

  • 5 star rating
    Good for power generators
    By  RAMSES,  a  Verified Buyer  from  Chicago  on  October 25, 2026

    Open report issue form

    Describe the issue

    Failed to verify captcha

    Cancel Submit
    Much better choice than using engine oil, generator runs quieter.
    Bottom Line

    Yes, I would recommend this to a friend.
    Was this review helpful?

    YES (0) NO (0)
  • 5 star rating
    Simplifying my life.
    By  PAUL,  a  Verified Buyer  from  Green Bay  on  October 23, 2026

    Open report issue form

    Describe the issue

    Failed to verify captcha

    Cancel Submit
    I have been and are currently using the Commmercial Grade 10w40 in all of my outdoor equipment ( with the exception of the snowblowers ) for quite some time now. I've noticed the engines run cooler and the oil seems cleaner ( I change at 100 hour intervals ) .No more dealing with the different weight and viscocity oils again. I run full synthetic in everything I own. I wont be going back to regular oil again.
    Bottom Line

    Yes, I would recommend this to a friend.
    Was this review helpful?

    YES (0) NO (0)
  • 5 star rating
    Full synthetic
    By  KARL,  a  Verified Buyer  from  Pennsylvania   on  October 18, 2026

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    Cancel Submit
    My lawnmower loves it
    Bottom Line

    Yes, I would recommend this to a friend.
    Was this review helpful?

    YES (1) NO (0)
  • 5 star rating
    Running good
    By  DAVE,  a  Verified Buyer  from  IND   on  October 01, 2026

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    Engines running cooler and smoother
    Bottom Line

    Yes, I would recommend this to a friend.
    Was this review helpful?

    YES (1) NO (0)
  • 5 star rating
    Excellent generator engine oil
    By  Ago,  a  Verified Buyer  from  New Jersey  on  September 27, 2026

    Open report issue form

    Describe the issue

    Failed to verify captcha

    Cancel Submit
    I only replace my generator oil with AmsOil Small Engine Oil, it keeps the engine running smooth and since it’s always running at full throttle it ensures that I minimize engine wear.
    Bottom Line

    Yes, I would recommend this to a friend.
    Was this review helpful?

    YES (2) NO (0)
  • 5 star rating
    Using for purpose needed is key
    By  MIKE,  a  Verified Buyer  from  The Villages Florida  on  September 25, 2026

    Open report issue form

    Describe the issue

    Failed to verify captcha

    Cancel Submit
    In the villages, a great way to get around is by golf cart. Purpose-built roads. I don't golf, but I do drive a ton of hours on my golf cart. I have used all kinds of different oils, all high-end stuff, not off-the-shelf stuff. My problem has been this. I realized that just because it is a great oil it depends on application. All the oils I used in my cart were for automotive purposes. This cart is a one-cylinder air cooled and splash lubricated. No oil filter. I was having fuel dilution issues, so after trying several oils, I wound up at Amzoil and tried their race go-kart oil or the Briggs and Stratton race oil, and that was great, but it's not meant for long use. Basically, a practice in your go-kart and race, then drain the oil. So it doesn't last. Also not built for my application. Then I tried the Small Engine Oil and perfection. WHAT A DIFFERANCE! Same performance as the race oil but doesn't break down fast. This is why they say use the correct oil for what you need for the engine that you have. Now can I run regular automotive oil in my golf cart? Sure, but it's really not for Golf Carts. Yamaha uses a mineral-based, non-synthetic oil. But the cart didn't run as good. This Small Engine Oil works great; it runs just as good as the Racing oil, and my golf cart has never run better. Now I can get more longevity out of the oil.
    Was this review helpful?

    YES (4) NO (0)
  • 5 star rating
    Full synthetic
    By  KARL,  a  Verified Buyer  from  Pennsylvania   on  September 20, 2026

    Open report issue form

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    The lawnmower likes it
    Bottom Line

    Yes, I would recommend this to a friend.
    Was this review helpful?

    YES (1) NO (0)
  • 5 star rating
    Works great in my 4K rv generator
    By  JAMES,  a  Verified Buyer  on  September 19, 2026

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    Good product
    Bottom Line

    Yes, I would recommend this to a friend.
    Was this review helpful?

    YES (0) NO (0)
  • 5 star rating
    The best
    By  TERENCE,  a  Verified Buyer  from  Amherst NY  on  September 18, 2026

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    Describe the issue

    Failed to verify captcha

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    The only Oil I use in my Ariens snow blower. I had issues with other oils and I will just leave it at that. Absolutely no issues after using this. Was not a coincidence this oil performs
    Bottom Line

    Yes, I would recommend this to a friend.
    Was this review helpful?

    YES (1) NO (0)
  • 5 star rating
    10w30 lawn mower oil
    By  DALE,  a  Verified Buyer  from  Picton Ontario   on  August 21, 2026

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    Engines run smoothly in all my mowers. Does not break down in hot weather!
    Bottom Line

    Yes, I would recommend this to a friend.
    Was this review helpful?

    YES (4) NO (0)