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
  Data Bulletin

  Data Bulletins

  Warranty

  WARRANTY

  SDS

  SDS

  
  
  
• Product Reviews
  5 star rating

  Based on 6,985 reviews

  Based on 6,985 reviews

  See all customer reviews

  Sort by

  Most Recent Most Helpful Highest Rating Lowest Rating Oldest

  • 5 star rating
    Oil and wix xp filter
    By  ANTHONY,  a  Verified Buyer  from  Rockford Illinois   on  July 23, 2026

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    Love the oil not so much the filter.I really wish you guys would get the amsoil ea17 filter back in stock, its been far to long they've been on back order.
    Bottom Line

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

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  • 5 star rating
    AMSOIL SAE 5W30 100% synthetic motor oil
    By  RONALD,  a  Verified Buyer  from  Phoenix, AZ  on  July 23, 2026

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    I have used this product in my 2000 Camry since 2004 (odometer: 71,000) until the present time (odometer 328,000 +) and in my 2006 Camry since May, 2025. I don't think that there is a better oil made! (By the way, I usually change the oil filter--I use the WIX oil filters--every 6 months.)
    Bottom Line

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

    YES (0) NO (0)
  • 5 star rating
    So far so good
    By  LARRY,  a  Verified Buyer  from  MO  on  July 23, 2026

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    I have done oil samples and after next test it should be a very informative result
    Bottom Line

    Yes, I would recommend this to a friend.
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  • 5 star rating
    oil for every vehicle
    By  BRODERICK,  a  Verified Buyer  on  July 22, 2026

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    From my 67 chevelle to my 2024 GMC Sierra my wife's car and the kids this oil has me covered
    Bottom Line

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

    YES (0) NO (0)
  • 5 star rating
    2850000
    By  HERBERT,  a  Verified Buyer  from  La  on  July 22, 2026

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    I have used it in my f150 with 2.7 got 285000 on my truck with no engine problems what so ever.
    Bottom Line

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

    YES (0) NO (0)
  • 5 star rating
    Great oil company
    By  MANNY,  a  Verified Buyer  from  Fayetteville NC  on  July 22, 2026

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    I always put Amsoil in all my vehicles and I highly recommend oil the 0/20 signature series is the best on the market never had a problem with any of my vehicles using Amsoil
    Bottom Line

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

    YES (0) NO (0)
  • 5 star rating
    Better product i ever bought
    By  SERGE,  a  Verified Buyer  from  Quebec canada  on  July 21, 2026

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    Iam gone stay a amsiol fan forever
    Bottom Line

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

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  • 5 star rating
    Better than the dealership provides
    By  SETH,  a  Verified Buyer  from  Texhoma   on  July 21, 2026

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    Great oil is the one thing I can rely on when the auto manufacturers keep reducing their oil viscosity to achieve fuel efficiency for some tree hugging politician.
    Bottom Line

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

    YES (0) NO (0)
  • 5 star rating
    25 elantra n
    By  JERALD,  a  Verified Buyer  on  July 21, 2026

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    Read all the reviews , watched all the videos, it's the only oil I'll trust in my car
    Bottom Line

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

    YES (0) NO (0)
  • 5 star rating
    The Only Truly Fully Synthetic Motor Oil
    By  WILSON,  a  Verified Buyer  from  5929 woodland ave  on  July 20, 2026

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    Whether viewed in terms of quiet operation or evaporation loss, it stands alone—no other product can hold a candle to it.
    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
  Data Bulletin

  Data Bulletins

  Warranty

  WARRANTY

  SDS

  SDS

  
  
  
• Product Reviews
  5 star rating

  Based on 6,985 reviews

  Based on 6,985 reviews

  See all customer reviews

  Sort by

  Most Recent Most Helpful Highest Rating Lowest Rating Oldest

  • 5 star rating
    Oil and wix xp filter
    By  ANTHONY,  a  Verified Buyer  from  Rockford Illinois   on  July 23, 2026

    Open report issue form

    Describe the issue

    Failed to verify captcha

    Cancel Submit
    Love the oil not so much the filter.I really wish you guys would get the amsoil ea17 filter back in stock, its been far to long they've been on back order.
    Bottom Line

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

    YES (0) NO (0)
  • 5 star rating
    AMSOIL SAE 5W30 100% synthetic motor oil
    By  RONALD,  a  Verified Buyer  from  Phoenix, AZ  on  July 23, 2026

    Open report issue form

    Describe the issue

    Failed to verify captcha

    Cancel Submit
    I have used this product in my 2000 Camry since 2004 (odometer: 71,000) until the present time (odometer 328,000 +) and in my 2006 Camry since May, 2025. I don't think that there is a better oil made! (By the way, I usually change the oil filter--I use the WIX oil filters--every 6 months.)
    Bottom Line

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

    YES (0) NO (0)
  • 5 star rating
    So far so good
    By  LARRY,  a  Verified Buyer  from  MO  on  July 23, 2026

    Open report issue form

    Describe the issue

    Failed to verify captcha

    Cancel Submit
    I have done oil samples and after next test it should be a very informative result
    Bottom Line

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

    YES (0) NO (0)
  • 5 star rating
    oil for every vehicle
    By  BRODERICK,  a  Verified Buyer  on  July 22, 2026

    Open report issue form

    Describe the issue

    Failed to verify captcha

    Cancel Submit
    From my 67 chevelle to my 2024 GMC Sierra my wife's car and the kids this oil has me covered
    Bottom Line

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

    YES (0) NO (0)
  • 5 star rating
    2850000
    By  HERBERT,  a  Verified Buyer  from  La  on  July 22, 2026

    Open report issue form

    Describe the issue

    Failed to verify captcha

    Cancel Submit
    I have used it in my f150 with 2.7 got 285000 on my truck with no engine problems what so ever.
    Bottom Line

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

    YES (0) NO (0)
  • 5 star rating
    Great oil company
    By  MANNY,  a  Verified Buyer  from  Fayetteville NC  on  July 22, 2026

    Open report issue form

    Describe the issue

    Failed to verify captcha

    Cancel Submit
    I always put Amsoil in all my vehicles and I highly recommend oil the 0/20 signature series is the best on the market never had a problem with any of my vehicles using Amsoil
    Bottom Line

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

    YES (0) NO (0)
  • 5 star rating
    Better product i ever bought
    By  SERGE,  a  Verified Buyer  from  Quebec canada  on  July 21, 2026

    Open report issue form

    Describe the issue

    Failed to verify captcha

    Cancel Submit
    Iam gone stay a amsiol fan forever
    Bottom Line

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

    YES (0) NO (0)
  • 5 star rating
    Better than the dealership provides
    By  SETH,  a  Verified Buyer  from  Texhoma   on  July 21, 2026

    Open report issue form

    Describe the issue

    Failed to verify captcha

    Cancel Submit
    Great oil is the one thing I can rely on when the auto manufacturers keep reducing their oil viscosity to achieve fuel efficiency for some tree hugging politician.
    Bottom Line

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

    YES (0) NO (0)
  • 5 star rating
    25 elantra n
    By  JERALD,  a  Verified Buyer  on  July 21, 2026

    Open report issue form

    Describe the issue

    Failed to verify captcha

    Cancel Submit
    Read all the reviews , watched all the videos, it's the only oil I'll trust in my car
    Bottom Line

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

    YES (0) NO (0)
  • 5 star rating
    The Only Truly Fully Synthetic Motor Oil
    By  WILSON,  a  Verified Buyer  from  5929 woodland ave  on  July 20, 2026

    Open report issue form

    Describe the issue

    Failed to verify captcha

    Cancel Submit
    Whether viewed in terms of quiet operation or evaporation loss, it stands alone—no other product can hold a candle to it.
    Bottom Line

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

    YES (0) NO (0)