☰
Shop by Vehicle
Find AMSOIL Near You
Roll over image to zoom in

10W-40 Synthetic Small Engine Oil

Product code : ASFQT-EA

5 star rating
Read 36 reviews
Read 36 reviews
See all customer reviews

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

10W-40 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 a heavy dose of zinc anti-wear additives.
  • Does not thin out due to mechanical shear, ensuring a thick lubricating film for maximum wear protection.
  • Zinc 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 Specification

10W-40 Synthetic Small Engine Oil

Data Bulletin

Warranty

SDS



Product Reviews

10W-40 Synthetic Small Engine Oil

5 star rating
Based on 36 reviews
Based on 36 reviews
See all customer reviews
  • 5 star rating
    Excellent quality exceeds OEM specs
    By  Stephen,  a  Verified Buyer  from  OKLAHOMA  on  August 21, 2023
    I use this in all small engines from FJ180V Kawasaki to FX751V Kawasaki, Honda GCV 190 etc. No issues, no oil usage...
    Bottom Line
    Yes, I would recommend this to a friend.
    Was this review helpful?
  • 5 star rating
    Small Engine oil
    By  JOEL,  a  Verified Buyer  from  Cloverdale In  on  August 08, 2023
    Has worked very well in my yard Equipment no problem.
    Bottom Line
    Yes, I would recommend this to a friend.
    Was this review helpful?
  • 5 star rating
    Use this in my zero turn
    By  ROBERT,  a  Verified Buyer  from  West point ms  on  August 02, 2023
    Use small engine amsoil 10-40 in my zero turn with kawasaki engine, after a full summer of use oil is clean and clear coming out as it was going in, amsoil is the best money can buy
    Bottom Line
    Yes, I would recommend this to a friend.
    Was this review helpful?
  • 5 star rating
    Great oil
    By  BRADLEY,  a  Verified Buyer  from  Missouri   on  July 13, 2023
    Stops oil consumption in older motors. I run it in all of my 4stroke power equipment.
    Bottom Line
    Yes, I would recommend this to a friend.
    Was this review helpful?
  • 5 star rating
    The only oil I run in my John Deere mower
    By  KYLE,  a  Verified Buyer  on  June 29, 2023
    Through the heat of summer and once per year drain intervals, this oil is the solution for my air-cooled Kawasaki-engined John Deere mower.
    Bottom Line
    Yes, I would recommend this to a friend.
    Was this review helpful?
  • 5 star rating
    Great Oil I Hope It Will Keep My Lawnmower Running Forever
    By  GLENN,  a  Verified Buyer  from  Kawartha Lakes, Ontario, Canada  on  June 27, 2023
    I used conventional petroleum oil for the first 5 hours as recommended by the engine manufacturer and then switched to Amsoil Small Engine Oil. After running the mower for another 10 hours I note the following - the oil still looks new; there appears to be little or no oil consumption; the engine seems to run cooler and smoother even though the weather is warmer. Time will tell if this keeps up. So far I rate it 5/5.
    Bottom Line
    Yes, I would recommend this to a friend.
    Was this review helpful?
  • 5 star rating
    Great Value
    By  GEORGE,  a  Verified Buyer  from  Goldsboro NC  on  June 08, 2023
    Been using this in my ZERO TURN MOWER for the past 2 years. It keeping the engine wear down and running great.
    Bottom Line
    Yes, I would recommend this to a friend.
    Was this review helpful?
  • 5 star rating
    OIL
    By  ROBERT,  a  Verified Buyer  from  West Palm Beach, Florida  on  October 04, 2022
    Love the Oil!
    Bottom Line
    Yes, I would recommend this to a friend.
    Was this review helpful?
  • 5 star rating
    Commercial use
    By  SCOTT,  a  Verified Buyer  from  Alabama  on  September 22, 2022
    I use this in my commercial mowers. Hundreds of ours so far. I personally would not go over 100 hours on any oil unless you have a separate oil resuvuir. All in all, this oil takes a beating and has I think made up the difference in price from cheaper oils.
    Bottom Line
    Yes, I would recommend this to a friend.
    Was this review helpful?
  • 5 star rating
    10W-40 Small engine oil
    By  BRAD,  a  Verified Buyer  from  TN  on  August 17, 2022
    Excellent oil for my Ferris Zero turn mower. It made my Kawasaki 23 hp motor much quieter and use less fuel.
    Bottom Line
    Yes, I would recommend this to a friend.
    Was this review helpful?