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

  Custom-Built to Outperform

  AMSOIL Signature Series 100% Synthetic Motor Oil is formulated for drivers who demand the absolute best engine protection. Built with advanced synthetic base oils and a precision-engineered additive system, it is designed to control wear, resist volatility and maintain viscosity under extreme heat, pressure and cold-start conditions. The result is uncompromising film strength, cleaner components and protection that pushes beyond industry standards into a class of its own.
  
  Modern engines place unprecedented stress on motor oil through turbocharging, direct injection, higher temperatures and extended service intervals. Signature Series is engineered to meet those challenges head on, delivering more protection, performance and confidence mile after mile, even during extreme use.

  See the Product Data Bulletin for full details.

  2X BETTER Protection Against Volatility

  AMSOIL Signature Series delivers 2X better protection against volatility,³ helping reduce oil consumption, minimize top-offs and keep engines cleaner over time.

  
  

   

  ³Based on AMSOIL Signature Series 0W-20 100% Synthetic Motor Oil compared to the API SQ limit using the ASTM D5800 Noack volatility test.

   

  Guards Against LSPI

  Low-speed pre-ignition (LSPI) remains a serious concern in today’s turbocharged, direct-injection engines, where uncontrolled combustion events can damage pistons and other critical components, especially as motor oil ages. AMSOIL Signature Series 100% Synthetic Motor Oil is engineered to help prevent LSPI by maintaining a strong, stable formulation that continues to deliver outstanding performance throughout the drain interval. Even after 25,000 miles of use, Signature Series delivers 4X more piston protection against LSPI⁴ than the industry standard requires.

  ⁴Using AMSOIL Signature Series 5W-30 100% Synthetic Motor Oil following a 25,000-mile service interval in the Sequence IX aged-oil LSPI test.

  Preserves Horsepower and Torque

  AMSOIL Signature Series 100% Synthetic Motor Oil is built to help engines run stronger, longer⁵ – helping to protect engines from performance loss throughout their life.

  

  ⁵Using Signature Series 100% Synthetic 5W-30 Motor Oil in a 2025 Ford F-150 Raptor in a 125K-mile accumulation study. Based on comparative start- and end-of-test horsepower and torque.

  Proven Cleaning Power

  In Sequence IIIH testing, AMSOIL Signature Series delivers 72% more protection against piston deposits than required by industry standards,⁶ helping ensure cleaner pistons and consistent performance over time.

  

  ⁶Based on AMSOIL Signature Series 5W-30 in the Sequence IIIH Test.

  Even after doubling the length of the Sequence IIIH test, Signature Series provided 31% better protection than required,⁷ demonstrating its ability to maintain cleanliness far beyond industry standards.

  

  ⁷Based on AMSOIL Signature Series 5W-30 in a double-length Sequence IIIH test.

  No Sludge, Just Protection

  During a 125K-mile accumulation study on a 2025 Ford F-150 Raptor, the engine experienced 0% oil screen plugging.⁸

  

  ⁸As demonstrated in a 125K-mile accumulation study on a 2025 Ford F-150 Raptor which had 0% plugging.

• Technical Specifications

  Data Bulletin

  Data Bulletins

  Warranty

  WARRANTY

  SDS

  SDS

  
  
  

• Product Reviews

  5 star rating

  Based on 7,218 reviews

  Based on 7,218 reviews

  See all customer reviews

  Sort by

  Most Recent Most Helpful Highest Rating Lowest Rating Oldest

  • 5 star rating
    Best thing I do for my truck
    By  STEVEN,  a  Verified Buyer  on  November 01, 2026

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    I bought a new late 24 Toyota Tundra. First thing I did was a break in oil and filter change at 500 miles. AMSOIL Signature 0W20 and AMSOIL Oil Filter. Every 4 to 5k.
    Bottom Line

    Yes, I would recommend this to a friend.
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  • 5 star rating
    Works great
    By  DANIEL,  a  Verified Buyer  from  Arizona   on  November 01, 2026

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    Works great engine feels smooth
    Bottom Line

    Yes, I would recommend this to a friend.
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  • 5 star rating
    Best oil
    By  LARRY,  a  Verified Buyer  from  Alabama  on  November 01, 2026

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    Best oil ever for my Toyota specifying 10,000 mile oil changes. I tested the Amsoil oil in it with an analyzer and it showed my oil life still had 20% life left with 12,000 miles on it. I decided to change the oil at 13,000 miles and tested the oil and it showed oil life at greater than 15% oil life left. Very pleased I can extend my change interval from 10,000 miles with confidence. Use Amsoil products in all my vehicles and equipment as it is the best out there.
    Bottom Line

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

    YES (0) NO (0)
  • 5 star rating
    Great products.
    By  REX,  a  Verified Buyer  from  Belfair WA   on  November 01, 2026

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    Totally satisfied with the products and the science behind it.
    Bottom Line

    Yes, I would recommend this to a friend.
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    YES (0) NO (0)
  • 5 star rating
    Best oil on the market
    By  TIM,  a  Verified Buyer  from  IA  on  November 01, 2026

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    I'm convinced that amsoil is the best oil you can buy
    Bottom Line

    Yes, I would recommend this to a friend.
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  • 5 star rating
    On 2nd oil change on my hybrid. No complaints
    By  JOSEPH,  a  Verified Buyer  on  November 01, 2026

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    I trust Amsoil products.
    Bottom Line

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

    YES (0) NO (0)
  • 5 star rating
    Best oil in the world game
    By  TERRENCE,  a  Verified Buyer  from  Baton Rouge   on  November 01, 2026

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    Saw a 2mpg increase since switching from Amsoil. I’m never going back to any other competitor
    Bottom Line

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

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  • 5 star rating
    Dodge Dart
    By  RYAN,  a  Verified Buyer  from  Sarnia Ontario  on  October 30, 2026

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    Use this in the dodge dart we bought my son, what a difference in everyday performance
    Bottom Line

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

    YES (0) NO (0)
  • 5 star rating
    AMSOIL MOTOR OIL
    By  JOSE,  a  Verified Buyer  from  PA  on  October 29, 2026

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    This is amazing stuff, First time user and never coming back. The first time was 80k and I thought started out with Amsoil High-mileage 5w30. After around 3-5 miles I notice that my engine was quite, really quite, so I took it on the highway, afterword's I was in shocked. I revved it up to 5.7k RPMs, spirited drive and I had to slow down. I don't have any leaks or burning oil but I thought I should tell you all that shear my experience. I'm changing to Amsoil Signature after 85k. Also changed Amsoil fluids, front/rear diff and brake fluid, next time I well change transmission fluid and transfer case fluid. 2020 EXPLORER ST
    Bottom Line

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

    YES (0) NO (0)
  • 5 star rating
    👍
    By  ELVIN,  a  Verified Buyer  from  Alabama   on  October 28, 2026

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    Work great
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• Highlights

  A New Level of Motor Oil Technology

  • Protects – Ultimate long-life anti-wear protection
  • Cleans – Fights sludge and carbon buildup¹
  • Adapts – Responds to changing conditions
  • Performs – Proven beyond the standard²

   

  ¹Based on Sequence VH and IIIH tests.
  ²Based on double-length Sequence IIIH test.

   

• 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

  Custom-Built to Outperform

  AMSOIL Signature Series 100% Synthetic Motor Oil is formulated for drivers who demand the absolute best engine protection. Built with advanced synthetic base oils and a precision-engineered additive system, it is designed to control wear, resist volatility and maintain viscosity under extreme heat, pressure and cold-start conditions. The result is uncompromising film strength, cleaner components and protection that pushes beyond industry standards into a class of its own.
  
  Modern engines place unprecedented stress on motor oil through turbocharging, direct injection, higher temperatures and extended service intervals. Signature Series is engineered to meet those challenges head on, delivering more protection, performance and confidence mile after mile, even during extreme use.

  See the Product Data Bulletin for full details.

  2X BETTER Protection Against Volatility

  AMSOIL Signature Series delivers 2X better protection against volatility,³ helping reduce oil consumption, minimize top-offs and keep engines cleaner over time.

  
  

   

  ³Based on AMSOIL Signature Series 0W-20 100% Synthetic Motor Oil compared to the API SQ limit using the ASTM D5800 Noack volatility test.

   

  Guards Against LSPI

  Low-speed pre-ignition (LSPI) remains a serious concern in today’s turbocharged, direct-injection engines, where uncontrolled combustion events can damage pistons and other critical components, especially as motor oil ages. AMSOIL Signature Series 100% Synthetic Motor Oil is engineered to help prevent LSPI by maintaining a strong, stable formulation that continues to deliver outstanding performance throughout the drain interval. Even after 25,000 miles of use, Signature Series delivers 4X more piston protection against LSPI⁴ than the industry standard requires.

  ⁴Using AMSOIL Signature Series 5W-30 100% Synthetic Motor Oil following a 25,000-mile service interval in the Sequence IX aged-oil LSPI test.

  Preserves Horsepower and Torque

  AMSOIL Signature Series 100% Synthetic Motor Oil is built to help engines run stronger, longer⁵ – helping to protect engines from performance loss throughout their life.

  

  ⁵Using Signature Series 100% Synthetic 5W-30 Motor Oil in a 2025 Ford F-150 Raptor in a 125K-mile accumulation study. Based on comparative start- and end-of-test horsepower and torque.

  Proven Cleaning Power

  In Sequence IIIH testing, AMSOIL Signature Series delivers 72% more protection against piston deposits than required by industry standards,⁶ helping ensure cleaner pistons and consistent performance over time.

  

  ⁶Based on AMSOIL Signature Series 5W-30 in the Sequence IIIH Test.

  Even after doubling the length of the Sequence IIIH test, Signature Series provided 31% better protection than required,⁷ demonstrating its ability to maintain cleanliness far beyond industry standards.

  

  ⁷Based on AMSOIL Signature Series 5W-30 in a double-length Sequence IIIH test.

  No Sludge, Just Protection

  During a 125K-mile accumulation study on a 2025 Ford F-150 Raptor, the engine experienced 0% oil screen plugging.⁸

  

  ⁸As demonstrated in a 125K-mile accumulation study on a 2025 Ford F-150 Raptor which had 0% plugging.

• Technical Specifications

  Data Bulletin

  Data Bulletins

  Warranty

  WARRANTY

  SDS

  SDS

  
  
  

• Product Reviews

  5 star rating

  Based on 7,218 reviews

  Based on 7,218 reviews

  See all customer reviews

  Sort by

  Most Recent Most Helpful Highest Rating Lowest Rating Oldest

  • 5 star rating
    Best thing I do for my truck
    By  STEVEN,  a  Verified Buyer  on  November 01, 2026

    Open report issue form

    Describe the issue

    Failed to verify captcha

    Cancel Submit
    I bought a new late 24 Toyota Tundra. First thing I did was a break in oil and filter change at 500 miles. AMSOIL Signature 0W20 and AMSOIL Oil Filter. Every 4 to 5k.
    Bottom Line

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

    YES (0) NO (0)
  • 5 star rating
    Works great
    By  DANIEL,  a  Verified Buyer  from  Arizona   on  November 01, 2026

    Open report issue form

    Describe the issue

    Failed to verify captcha

    Cancel Submit
    Works great engine feels smooth
    Bottom Line

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

    YES (0) NO (0)
  • 5 star rating
    Best oil
    By  LARRY,  a  Verified Buyer  from  Alabama  on  November 01, 2026

    Open report issue form

    Describe the issue

    Failed to verify captcha

    Cancel Submit
    Best oil ever for my Toyota specifying 10,000 mile oil changes. I tested the Amsoil oil in it with an analyzer and it showed my oil life still had 20% life left with 12,000 miles on it. I decided to change the oil at 13,000 miles and tested the oil and it showed oil life at greater than 15% oil life left. Very pleased I can extend my change interval from 10,000 miles with confidence. Use Amsoil products in all my vehicles and equipment as it is the best out there.
    Bottom Line

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

    YES (0) NO (0)
  • 5 star rating
    Great products.
    By  REX,  a  Verified Buyer  from  Belfair WA   on  November 01, 2026

    Open report issue form

    Describe the issue

    Failed to verify captcha

    Cancel Submit
    Totally satisfied with the products and the science behind it.
    Bottom Line

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

    YES (0) NO (0)
  • 5 star rating
    Best oil on the market
    By  TIM,  a  Verified Buyer  from  IA  on  November 01, 2026

    Open report issue form

    Describe the issue

    Failed to verify captcha

    Cancel Submit
    I'm convinced that amsoil is the best oil you can buy
    Bottom Line

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

    YES (0) NO (0)
  • 5 star rating
    On 2nd oil change on my hybrid. No complaints
    By  JOSEPH,  a  Verified Buyer  on  November 01, 2026

    Open report issue form

    Describe the issue

    Failed to verify captcha

    Cancel Submit
    I trust Amsoil products.
    Bottom Line

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

    YES (0) NO (0)
  • 5 star rating
    Best oil in the world game
    By  TERRENCE,  a  Verified Buyer  from  Baton Rouge   on  November 01, 2026

    Open report issue form

    Describe the issue

    Failed to verify captcha

    Cancel Submit
    Saw a 2mpg increase since switching from Amsoil. I’m never going back to any other competitor
    Bottom Line

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

    YES (0) NO (0)
  • 5 star rating
    Dodge Dart
    By  RYAN,  a  Verified Buyer  from  Sarnia Ontario  on  October 30, 2026

    Open report issue form

    Describe the issue

    Failed to verify captcha

    Cancel Submit
    Use this in the dodge dart we bought my son, what a difference in everyday performance
    Bottom Line

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

    YES (0) NO (0)
  • 5 star rating
    AMSOIL MOTOR OIL
    By  JOSE,  a  Verified Buyer  from  PA  on  October 29, 2026

    Open report issue form

    Describe the issue

    Failed to verify captcha

    Cancel Submit
    This is amazing stuff, First time user and never coming back. The first time was 80k and I thought started out with Amsoil High-mileage 5w30. After around 3-5 miles I notice that my engine was quite, really quite, so I took it on the highway, afterword's I was in shocked. I revved it up to 5.7k RPMs, spirited drive and I had to slow down. I don't have any leaks or burning oil but I thought I should tell you all that shear my experience. I'm changing to Amsoil Signature after 85k. Also changed Amsoil fluids, front/rear diff and brake fluid, next time I well change transmission fluid and transfer case fluid. 2020 EXPLORER ST
    Bottom Line

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

    YES (0) NO (0)
  • 5 star rating
    👍
    By  ELVIN,  a  Verified Buyer  from  Alabama   on  October 28, 2026

    Open report issue form

    Describe the issue

    Failed to verify captcha

    Cancel Submit
    Work great
    Was this review helpful?

    YES (0) NO (0)