About this item

• Product Overview

  Compare Motor Oil

  Compare Motor Oil

  

  	Signature Series	Extended-Life (XL)	High-Mileage	Hybrid	OE
  Wear Protection
  Engine Cleanliness
  Service Interval
  Extreme Temp Performance
  Corrosion Protection
  Oil-Consumption Control
  Viscosity Control
  Leak Protection
  Severe-Service Protection

  View Full Image

  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 Specifications

  Data Bulletin

  Data Bulletins

  Warranty

  WARRANTY

  SDS

  SDS

  
  
  

• Product Reviews

  4.9 star rating

  Based on 1,496 reviews

  Based on 1,496 reviews

  See all customer reviews

  Sort by

  Most Recent Most Helpful Highest Rating Lowest Rating Oldest

  • 5 star rating
    Awesome
    By  WILLIAM,  a  Verified Buyer  on  November 10, 2026

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    awesome product.
    Bottom Line

    Yes, I would recommend this to a friend.
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  • 5 star rating
    Stays clean longer
    By  Hank,  a  Verified Buyer  from  Mt Pleasant, UT  on  November 09, 2026

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    Good extended life oil
    Bottom Line

    Yes, I would recommend this to a friend.
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  • 5 star rating
    Quick shipment Excellent service
    By  CHRIS,  a  Verified Buyer  from  Oregon   on  November 05, 2026

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    User-friendly website. Excellent communication and shipping. Highly recommended product.
    Bottom Line

    Yes, I would recommend this to a friend.
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  • 5 star rating
    Best oil money can buy
    By  WILLIAM,  a  Verified Buyer  from  Pennsylvania  on  October 22, 2026

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    There's no better oil on the market than Asmoil; it's the best. Thanks.
    Bottom Line

    Yes, I would recommend this to a friend.
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  • 5 star rating
    Great
    By  NATHAN,  a  Verified Buyer  on  October 20, 2026

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    Every 6 months
    Bottom Line

    Yes, I would recommend this to a friend.
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  • 5 star rating
    High mileage
    By  RICK,  a  Verified Buyer  from  Osceola   on  October 18, 2026

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    I’ve been running Amsoil in my S-10, Astro Van, 1987 Harley-Davidson ( bought new myself), 2005 Peterbilt, Wheelhorse 312-8, chainsaws, lawnmowers, and snowblower. I am more than happy with Amsoil products. I use Amsoil grease as well. The newest machine I own is the 2005 Peterbilt. I highly recommend their products.
    Bottom Line

    Yes, I would recommend this to a friend.
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    YES (0) NO (0)
  • 5 star rating
    Best product. Best service
    By  MIKE,  a  Verified Buyer  from  TX  on  October 17, 2026

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    High mileage goals with the right product. I protect all my vehicles with Amsoil. The proof is in the oil analysis and longevity I get with my vehicles.
    Bottom Line

    Yes, I would recommend this to a friend.
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    YES (0) NO (0)
  • 5 star rating
    Great oil
    By  KEVIN,  a  Verified Buyer  on  October 16, 2026

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    Great oil for a high mileage vehicle
    Bottom Line

    Yes, I would recommend this to a friend.
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  • 5 star rating
    Good for my whole fleet.
    By  EP in WNC,  a  Verified Buyer  from  Asheville  on  October 13, 2026

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    All the family's rides call for 0W-20, so picking this up by the case is a no-brainer. I can count on many miles of happy motoring.
    Bottom Line

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

    YES (0) NO (0)
  • 4 star rating
    Good Oil
    By  DANIEL,  a  Verified Buyer  from  GA  on  October 10, 2026

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    This is a good oil and the containers are convenient. The company ships quickly with very good packaging.
    Bottom Line

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

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• Highlights

  • 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.

• 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

  Compare Motor Oil

  Compare Motor Oil

  

  	Signature Series	Extended-Life (XL)	High-Mileage	Hybrid	OE
  Wear Protection
  Engine Cleanliness
  Service Interval
  Extreme Temp Performance
  Corrosion Protection
  Oil-Consumption Control
  Viscosity Control
  Leak Protection
  Severe-Service Protection

  View Full Image

  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 Specifications

  Data Bulletin

  Data Bulletins

  Warranty

  WARRANTY

  SDS

  SDS

  
  
  

• Product Reviews

  4.9 star rating

  Based on 1,496 reviews

  Based on 1,496 reviews

  See all customer reviews

  Sort by

  Most Recent Most Helpful Highest Rating Lowest Rating Oldest

  • 5 star rating
    Awesome
    By  WILLIAM,  a  Verified Buyer  on  November 10, 2026

    Open report issue form

    Describe the issue

    Failed to verify captcha

    Cancel Submit
    awesome product.
    Bottom Line

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

    YES (0) NO (0)
  • 5 star rating
    Stays clean longer
    By  Hank,  a  Verified Buyer  from  Mt Pleasant, UT  on  November 09, 2026

    Open report issue form

    Describe the issue

    Failed to verify captcha

    Cancel Submit
    Good extended life oil
    Bottom Line

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

    YES (0) NO (0)
  • 5 star rating
    Quick shipment Excellent service
    By  CHRIS,  a  Verified Buyer  from  Oregon   on  November 05, 2026

    Open report issue form

    Describe the issue

    Failed to verify captcha

    Cancel Submit
    User-friendly website. Excellent communication and shipping. Highly recommended product.
    Bottom Line

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

    YES (0) NO (0)
  • 5 star rating
    Best oil money can buy
    By  WILLIAM,  a  Verified Buyer  from  Pennsylvania  on  October 22, 2026

    Open report issue form

    Describe the issue

    Failed to verify captcha

    Cancel Submit
    There's no better oil on the market than Asmoil; it's the best. Thanks.
    Bottom Line

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

    YES (0) NO (0)
  • 5 star rating
    Great
    By  NATHAN,  a  Verified Buyer  on  October 20, 2026

    Open report issue form

    Describe the issue

    Failed to verify captcha

    Cancel Submit
    Every 6 months
    Bottom Line

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

    YES (0) NO (0)
  • 5 star rating
    High mileage
    By  RICK,  a  Verified Buyer  from  Osceola   on  October 18, 2026

    Open report issue form

    Describe the issue

    Failed to verify captcha

    Cancel Submit
    I’ve been running Amsoil in my S-10, Astro Van, 1987 Harley-Davidson ( bought new myself), 2005 Peterbilt, Wheelhorse 312-8, chainsaws, lawnmowers, and snowblower. I am more than happy with Amsoil products. I use Amsoil grease as well. The newest machine I own is the 2005 Peterbilt. I highly recommend their products.
    Bottom Line

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

    YES (0) NO (0)
  • 5 star rating
    Best product. Best service
    By  MIKE,  a  Verified Buyer  from  TX  on  October 17, 2026

    Open report issue form

    Describe the issue

    Failed to verify captcha

    Cancel Submit
    High mileage goals with the right product. I protect all my vehicles with Amsoil. The proof is in the oil analysis and longevity I get with my vehicles.
    Bottom Line

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

    YES (0) NO (0)
  • 5 star rating
    Great oil
    By  KEVIN,  a  Verified Buyer  on  October 16, 2026

    Open report issue form

    Describe the issue

    Failed to verify captcha

    Cancel Submit
    Great oil for a high mileage vehicle
    Bottom Line

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

    YES (0) NO (0)
  • 5 star rating
    Good for my whole fleet.
    By  EP in WNC,  a  Verified Buyer  from  Asheville  on  October 13, 2026

    Open report issue form

    Describe the issue

    Failed to verify captcha

    Cancel Submit
    All the family's rides call for 0W-20, so picking this up by the case is a no-brainer. I can count on many miles of happy motoring.
    Bottom Line

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

    YES (0) NO (0)
  • 4 star rating
    Good Oil
    By  DANIEL,  a  Verified Buyer  from  GA  on  October 10, 2026

    Open report issue form

    Describe the issue

    Failed to verify captcha

    Cancel Submit
    This is a good oil and the containers are convenient. The company ships quickly with very good packaging.
    Bottom Line

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

    YES (0) NO (0)