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AMSOIL Signature Series 5W-30 100% Synthetic Motor OilQuart Bottle
Product code : ASLQT-EA
New Signature Series is rolling out as inventory of the prior formulation is used up. Orders may include new or previous versions. Both meet our performance standards and deliver the protection you demand.
AMSOIL Signature Series 5W-30 100% Synthetic Motor OilQuart Bottle
Product code : ASLQT-EA
New Signature Series is rolling out as inventory of the prior formulation is used up. Orders may include new or previous versions. Both meet our performance standards and deliver the protection you demand.
Current price:
$17.99
Retail Price
Quart Bottle is temporarily out of stock. Try another available size from the menu above.
Estimated delivery by Wed, Sep 23
to Columbus - 43215.
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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. -
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.
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We accept Visa, Mastercard, American Express, Discover and PayPal, and provide secure checkout and encrypted payment processing.
About this item
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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.
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star rating
Great Oul for GDI EngineBy CRAIG, a Verified Buyer from Louisville on September 19, 2026Great oil. All I use on my Kia Telluride.Bottom LineYes, I would recommend this to a friend.Was this review helpful?
-
star rating
Used in my new land cruiserBy JAMES, a Verified Buyer on September 19, 2026Runs coolBottom LineYes, I would recommend this to a friend.Was this review helpful?
-
star rating
Great productBy ELLIOTT, a Verified Buyer from SC on September 19, 2026Top Tier productBottom LineYes, I would recommend this to a friend.Was this review helpful?
-
star rating
Superior Engine OilBy PETE, a Verified Buyer from Boston, MA on September 19, 2026I am very happy with Amsoil products. Quieter morning start. Overall super happy with my engine performance.Bottom LineYes, I would recommend this to a friend.Was this review helpful?
-
star rating
👍🏼By BILL, a Verified Buyer on September 19, 2026👍🏼Bottom LineYes, I would recommend this to a friend.Was this review helpful?
-
star rating
Safe BetBy TERENCE, a Verified Buyer from Amherst NY on September 18, 2026With all the issues going on right now with motor oil due to war in the Middle East .This Oil only gets better. While other Big Oil companies lie and deceive about the problems they are having and formula changes , This is the only oil I trustBottom LineYes, I would recommend this to a friend.Was this review helpful?
-
star rating
The bestBy REINALDO, a Verified Buyer on September 18, 2026I would not use any other oil. I've been using Amsoil for nearly 20 yrs.Bottom LineYes, I would recommend this to a friend.Was this review helpful?
-
star rating
No problem so far with my trucks, one is over 300,000 miles.By None, a Verified Buyer from Rock Point, Az on September 18, 2026Oil is great, does the job. Just change the oil after 4.5k. No worries.Bottom LineYes, I would recommend this to a friend.Was this review helpful?
-
star rating
Master Synthetic BrandsBy GERARDO, a Verified Buyer from Florida on September 17, 2026Quality, proven results. My 2008 Mitsubishi Outlander SE has over 240k miles, my 1999 GMC Yukon Denali has over 220k miles, my 2016 GMC Canyon Diesel 2.8L Diesel has over 178k miles, all purchased brand new. I use the synthetic diesel oil for that one. I’m asking for AMSOIL to keep the formula that works, don’t try to make it better by cheaper ingredients, stay the course, otherwise you’ll end this great product.Was this review helpful?
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star rating
GoodBy DARIEL, a Verified Buyer on September 17, 2026Very good product and great delivery, excellent company i love it , i going to use it foreverBottom LineYes, I would recommend this to a friend.Was this review helpful?
-
star rating
Compare Motor Oil
Data Bulletins-
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. -
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.
-
We accept Visa, Mastercard, American Express, Discover and PayPal, and provide secure checkout and encrypted payment processing.
-
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.
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-
star rating
Great Oul for GDI EngineBy CRAIG, a Verified Buyer from Louisville on September 19, 2026Great oil. All I use on my Kia Telluride.Bottom LineYes, I would recommend this to a friend.Was this review helpful?
-
star rating
Used in my new land cruiserBy JAMES, a Verified Buyer on September 19, 2026Runs coolBottom LineYes, I would recommend this to a friend.Was this review helpful?
-
star rating
Great productBy ELLIOTT, a Verified Buyer from SC on September 19, 2026Top Tier productBottom LineYes, I would recommend this to a friend.Was this review helpful?
-
star rating
Superior Engine OilBy PETE, a Verified Buyer from Boston, MA on September 19, 2026I am very happy with Amsoil products. Quieter morning start. Overall super happy with my engine performance.Bottom LineYes, I would recommend this to a friend.Was this review helpful?
-
star rating
👍🏼By BILL, a Verified Buyer on September 19, 2026👍🏼Bottom LineYes, I would recommend this to a friend.Was this review helpful?
-
star rating
Safe BetBy TERENCE, a Verified Buyer from Amherst NY on September 18, 2026With all the issues going on right now with motor oil due to war in the Middle East .This Oil only gets better. While other Big Oil companies lie and deceive about the problems they are having and formula changes , This is the only oil I trustBottom LineYes, I would recommend this to a friend.Was this review helpful?
-
star rating
The bestBy REINALDO, a Verified Buyer on September 18, 2026I would not use any other oil. I've been using Amsoil for nearly 20 yrs.Bottom LineYes, I would recommend this to a friend.Was this review helpful?
-
star rating
No problem so far with my trucks, one is over 300,000 miles.By None, a Verified Buyer from Rock Point, Az on September 18, 2026Oil is great, does the job. Just change the oil after 4.5k. No worries.Bottom LineYes, I would recommend this to a friend.Was this review helpful?
-
star rating
Master Synthetic BrandsBy GERARDO, a Verified Buyer from Florida on September 17, 2026Quality, proven results. My 2008 Mitsubishi Outlander SE has over 240k miles, my 1999 GMC Yukon Denali has over 220k miles, my 2016 GMC Canyon Diesel 2.8L Diesel has over 178k miles, all purchased brand new. I use the synthetic diesel oil for that one. I’m asking for AMSOIL to keep the formula that works, don’t try to make it better by cheaper ingredients, stay the course, otherwise you’ll end this great product.Was this review helpful?
-
star rating
GoodBy DARIEL, a Verified Buyer on September 17, 2026Very good product and great delivery, excellent company i love it , i going to use it foreverBottom LineYes, I would recommend this to a friend.Was this review helpful?
-
star rating
