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AMSOIL Extended-Life 10W-40 100% Synthetic Motor Oil

Product code : XLOQT-EA

4.9 star rating
Read 1,385 reviews
Read 1,385 reviews

  • 37% more cleaning power1 to help keep your engine running smoother, longer.
  • Protects against LSPI
  • 20,000 miles of guaranteed protection between changes2

1Compared to AMSOIL OE Synthetic Motor Oil.
2Normal Service – Up to 20,000 miles (32,000 km) or one year, whichever comes first, in personal vehicles not operating under severe service.

Product Overview

AMSOIL Extended-Life 10W-40 100% Synthetic Motor Oil



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AMSOIL Extended-Life 100% Synthetic Motor Oil is overbuilt for road warriors so you can confidently drive up to 20,000 miles or one year,2 whichever comes first, between oil changes. A proprietary combination of advanced synthetic base oils and a boosted additive package promotes cleanliness and prolonged engine life. AMSOIL Extended-Life protection delivers peace of mind and convenience.

See the Product Data Bulletin for full details. 

RESISTS OIL BREAKDOWN

  • Maintains viscosity under the most extreme conditions.
  • Reduces excessive oil consumption, engine deposits, accelerated wear and difficult cold starts.

PROTECTS PISTONS FROM LOW-SPEED PRE-IGNITION

  • Features unique chemistry proven to protect your engine against harmful effects of low-speed pre-ignition (LSPI).

KEEPS ENGINES CLEAN

  • Fortified with detergent and dispersant additives.
  • Boosted additive package effectively neutralizes acids and resists sludge, corrosion and carbon deposits.

REDUCES MAINTAINENCE

  • Outstanding protection benefits motorists, business owners and fleet managers.
  • Extended-drain intervals reduce expensive, time-consuming and inconvenient oil changes.
  • Extended drain intervals up to 20,000 miles or one year,2 if you choose, allowing you to change oil on your schedule, reduce maintenance, save money and reduce waste oil.
Technical Specification

AMSOIL Extended-Life 10W-40 100% Synthetic Motor Oil

Data Bulletin

Warranty

SDS



Product Reviews

AMSOIL Extended-Life 10W-40 100% Synthetic Motor Oil

4.9 star rating
Based on 1,385 reviews
Based on 1,385 reviews
See all customer reviews
  • 5 star rating
    335,000 miles
    By  SCOTT,  a  Verified Buyer  from  Maryland   on  July 04, 2025
    1995 nissan pickup with 325,000 miles
    Bottom Line
    Yes, I would recommend this to a friend.
    Was this review helpful?
  • 5 star rating
    Great Product, Worth the Price
    By  JAMES,  a  Verified Buyer  from  Kansas City  on  July 03, 2025
    Recently purchased this for my wife's 2023 GMC Acadia. After changing the oil, the motor was noticeably quieter and smoother. I was hesitant at first to spend the additional money for the Amsoil, after all, "oil is oil right". Not the case at all! I will be purchasing Amsoil from here on out for our vehicles!
    Bottom Line
    Yes, I would recommend this to a friend.
    Was this review helpful?
  • 5 star rating
    Best oil in the market
    By  DALE,  a  Verified Buyer  from  Nevada  on  June 29, 2025
    After my oil change, I drove my car for 100 miles, and I felt a big difference in the performance. I had no loss power, and the engine ran smoother than before. I am very pleased with my choice in the oil. I plan to continue using this product in my future oil changes.
    Bottom Line
    Yes, I would recommend this to a friend.
    Was this review helpful?
  • 5 star rating
    Quality product!
    By  MARC,  a  Verified Buyer  on  June 27, 2025
    I’ve noticed my ‘92 Firebird’s engine (141,000 miles) quiet down a bit after the oil change.
    Bottom Line
    Yes, I would recommend this to a friend.
    Was this review helpful?
  • 5 star rating
    Great Oil
    By  PaulRapid,  a  Verified Buyer  from  WV  on  June 22, 2025
    Have been using this oil for more than 5 years and have had no problems and no oil usage between changes on 3.5 v6 Highlander with 190,000 miles Still gets 22mpg before AMSOIL got 21 mpg !
    Bottom Line
    Yes, I would recommend this to a friend.
    Was this review helpful?
  • 5 star rating
    Amsoil oil
    By  KEVIN,  a  Verified Buyer  from  Fort Worth   on  June 21, 2025
    I have been using Amsoil extended life oil since 2005. As of this moment I have never had a mechanical problem. I change the oil every 6 months so have not actually got to the 25,000 mile mark.
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  • 5 star rating
    Oil & Filter
    By  DON,  a  Verified Buyer  from  Mi   on  June 15, 2025
    I have be using these products for years and I would recommend them to everyone!
    Bottom Line
    Yes, I would recommend this to a friend.
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  • 5 star rating
    As Expected
    By  GREG,  a  Verified Buyer  from  Arizona  on  June 08, 2025
    Just completed my second LOF on my 3.6l Jeep. First fill went 12 months. No leaks, gas mileage didn’t change, and no strange noises. I will continue to use Amsoil.
    Bottom Line
    Yes, I would recommend this to a friend.
    Was this review helpful?
  • 5 star rating
    Simply the best Oil
    By  JASON,  a  Verified Buyer  on  June 06, 2025
    Topnotch fluids. Can't go wrong with AMSOIL. Quality can't be beat.
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  • 5 star rating
    Great motor oil!
    By  WADE,  a  Verified Buyer  from  Houston  on  June 03, 2025
    I use this motor oil for our F150 truck. It has really kept things running smoothly. Life of the oil is great!
    Bottom Line
    Yes, I would recommend this to a friend.
    Was this review helpful?