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

  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
  Performance Studies

  Las Vegas Taxi Cab Field Study

  Data Bulletin

  Data Bulletins

  Warranty

  WARRANTY

  SDS

  SDS

  
  
  
• Product Reviews
  5 star rating

  Based on 6,956 reviews

  Based on 6,956 reviews

  See all customer reviews

  Sort by

  Most Recent Most Helpful Highest Rating Lowest Rating Oldest

  • 5 star rating
    No brainier
    By  ERIC,  a  Verified Buyer  from  Idaho  on  July 16, 2026

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    Excellent product- when I need my engine to go the distance this is the real deal! Never had an engine go bad using Amsoil!! That’s hundreds of thousands of miles in all conditions!!
    Bottom Line

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

    YES (0) NO (0)
  • 5 star rating
    Amsoil Synthetic 0W20
    By  WALTER,  a  Verified Buyer  from  Utah  on  July 16, 2026

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    I really like being able to get the prices from directly ordering Amsoil and the quick shipping service. Makes my life and my trucks life easier!
    Bottom Line

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

    YES (0) NO (0)
  • 5 star rating
    Switch to Amsoil
    By  JARED,  a  Verified Buyer  from  20602  on  July 16, 2026

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    Great choice, my engine runs smoother than before. I'll switch all other fluids to Amsoil soon. F150 4x4 out.
    Bottom Line

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

    YES (0) NO (0)
  • 5 star rating
    Great oil
    By  GEARY,  a  Verified Buyer  from  Noble ok  on  July 16, 2026

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    After reviewing all the oils they had the Amsoil had the best flow rate for cold oil plus the signature oil is great
    Bottom Line

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

    YES (0) NO (0)
  • 5 star rating
    Availability of AMSOIL oil filters.
    By  DANIEL,  a  Verified Buyer  on  July 14, 2026

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    Everything is good with the exception of the availability AMSOIL oil filters.
    Bottom Line

    Yes, I would recommend this to a friend.
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    YES (0) NO (0)
  • 5 star rating
    very good oil
    By  DONALD,  a  Verified Buyer  from  birmingham ala.  on  July 14, 2026

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    love this oil
    Bottom Line

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

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  • 5 star rating
    El mejor
    By  JOSE,  a  Verified Buyer  from  Houston TX   on  July 12, 2026

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    Es el mejor aceite desde que lo cambie mi vehículo da mejor rendimiento mayor toque y más suave
    Bottom Line

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

    YES (0) NO (0)
  • 5 star rating
    Used in motorhome
    By  DOUGLAS,  a  Verified Buyer  from  Richland Washington   on  July 12, 2026

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    Great oil, engine actually sounds better and feels like it runs smoother.
    Bottom Line

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

    YES (0) NO (0)
  • 5 star rating
    Oil filter
    By  VINCENT,  a  Verified Buyer  from  Phoenix   on  July 12, 2026

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    Love the products but only thing I have an issue with is the lack of stock on and oil filters! When I order a oil change kit I don’t want the wix filter if I wanted that I’d go to the local parts store
    Bottom Line

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

    YES (1) NO (0)
  • 5 star rating
    Best motor oil on the market!
    By  ERIK,  a  Verified Buyer  from  Indiana   on  July 11, 2026

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    I started using this oil in 2009 in a Toyota Avalon with 230k miles. That same car now has 456k miles and runs as smooth as a top! I run the oil for 20-25k miles, changing the filter in the middle of the interval. I would not put anything else in my vehicles!
    Bottom Line

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

    YES (0) NO (0)

• 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

  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
  Performance Studies

  Las Vegas Taxi Cab Field Study

  Data Bulletin

  Data Bulletins

  Warranty

  WARRANTY

  SDS

  SDS

  
  
  
• Product Reviews
  5 star rating

  Based on 6,956 reviews

  Based on 6,956 reviews

  See all customer reviews

  Sort by

  Most Recent Most Helpful Highest Rating Lowest Rating Oldest

  • 5 star rating
    No brainier
    By  ERIC,  a  Verified Buyer  from  Idaho  on  July 16, 2026

    Open report issue form

    Describe the issue

    Failed to verify captcha

    Cancel Submit
    Excellent product- when I need my engine to go the distance this is the real deal! Never had an engine go bad using Amsoil!! That’s hundreds of thousands of miles in all conditions!!
    Bottom Line

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

    YES (0) NO (0)
  • 5 star rating
    Amsoil Synthetic 0W20
    By  WALTER,  a  Verified Buyer  from  Utah  on  July 16, 2026

    Open report issue form

    Describe the issue

    Failed to verify captcha

    Cancel Submit
    I really like being able to get the prices from directly ordering Amsoil and the quick shipping service. Makes my life and my trucks life easier!
    Bottom Line

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

    YES (0) NO (0)
  • 5 star rating
    Switch to Amsoil
    By  JARED,  a  Verified Buyer  from  20602  on  July 16, 2026

    Open report issue form

    Describe the issue

    Failed to verify captcha

    Cancel Submit
    Great choice, my engine runs smoother than before. I'll switch all other fluids to Amsoil soon. F150 4x4 out.
    Bottom Line

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

    YES (0) NO (0)
  • 5 star rating
    Great oil
    By  GEARY,  a  Verified Buyer  from  Noble ok  on  July 16, 2026

    Open report issue form

    Describe the issue

    Failed to verify captcha

    Cancel Submit
    After reviewing all the oils they had the Amsoil had the best flow rate for cold oil plus the signature oil is great
    Bottom Line

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

    YES (0) NO (0)
  • 5 star rating
    Availability of AMSOIL oil filters.
    By  DANIEL,  a  Verified Buyer  on  July 14, 2026

    Open report issue form

    Describe the issue

    Failed to verify captcha

    Cancel Submit
    Everything is good with the exception of the availability AMSOIL oil filters.
    Bottom Line

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

    YES (0) NO (0)
  • 5 star rating
    very good oil
    By  DONALD,  a  Verified Buyer  from  birmingham ala.  on  July 14, 2026

    Open report issue form

    Describe the issue

    Failed to verify captcha

    Cancel Submit
    love this oil
    Bottom Line

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

    YES (0) NO (0)
  • 5 star rating
    El mejor
    By  JOSE,  a  Verified Buyer  from  Houston TX   on  July 12, 2026

    Open report issue form

    Describe the issue

    Failed to verify captcha

    Cancel Submit
    Es el mejor aceite desde que lo cambie mi vehículo da mejor rendimiento mayor toque y más suave
    Bottom Line

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

    YES (0) NO (0)
  • 5 star rating
    Used in motorhome
    By  DOUGLAS,  a  Verified Buyer  from  Richland Washington   on  July 12, 2026

    Open report issue form

    Describe the issue

    Failed to verify captcha

    Cancel Submit
    Great oil, engine actually sounds better and feels like it runs smoother.
    Bottom Line

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

    YES (0) NO (0)
  • 5 star rating
    Oil filter
    By  VINCENT,  a  Verified Buyer  from  Phoenix   on  July 12, 2026

    Open report issue form

    Describe the issue

    Failed to verify captcha

    Cancel Submit
    Love the products but only thing I have an issue with is the lack of stock on and oil filters! When I order a oil change kit I don’t want the wix filter if I wanted that I’d go to the local parts store
    Bottom Line

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

    YES (1) NO (0)
  • 5 star rating
    Best motor oil on the market!
    By  ERIK,  a  Verified Buyer  from  Indiana   on  July 11, 2026

    Open report issue form

    Describe the issue

    Failed to verify captcha

    Cancel Submit
    I started using this oil in 2009 in a Toyota Avalon with 230k miles. That same car now has 456k miles and runs as smooth as a top! I run the oil for 20-25k miles, changing the filter in the middle of the interval. I would not put anything else in my vehicles!
    Bottom Line

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

    YES (0) NO (0)