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AMSOIL Signature Series 5W-20 100% Synthetic Motor OilQuart Bottle
Product code : ALMQT-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-20 100% Synthetic Motor OilQuart Bottle
Product code : ALMQT-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 30
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
Quality productsBy ERIC, a Verified Buyer from Wichita, KS on September 26, 2026Amsoil products are all that I will useBottom LineYes, I would recommend this to a friend.Was this review helpful?
-
star rating
Great oilBy THOMAS, a Verified Buyer from Montana on September 26, 2026Great oil, I believe it's great for my high mileage Lexus GX470.Bottom LineYes, I would recommend this to a friend.Was this review helpful?
-
star rating
Better shiftingBy CHUNG, a Verified Buyer from Rogers AR 72756 on September 26, 2026Best oil in my opinion....after changing amsoil transmission oil ...my Tundra shifting better than factoryBottom LineYes, I would recommend this to a friend.Was this review helpful?
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star rating
The only choice!By NICHOLAS, a Verified Buyer from Rhode Island on September 25, 2026Been using this oil on my 2020 tundra since 25k now at 137,000. 2013 jeep compass and 2025 jeep compass. I have not had a single car or truck run better on anything else noise or performance wise.Bottom LineYes, I would recommend this to a friend.Was this review helpful?
-
star rating
Engine oil on my trucksBy Javier, a Verified Buyer from Texas on September 25, 2026I only use this oil none elseBottom LineYes, I would recommend this to a friend.Was this review helpful?
-
star rating
It worksBy ROBERT, a Verified Buyer on September 25, 2026Math works Preferred customer works Oil worksBottom LineYes, I would recommend this to a friend.Was this review helpful?
-
star rating
A must for GM 6.2By MARK, a Verified Buyer from Colorado on September 24, 2026My 2023 Sierra 6.2 used to knock on start up and now its super smooth. I also get better MPG vs the old full synthetic I used to run. A++Bottom LineYes, I would recommend this to a friend.Was this review helpful?
-
star rating
GoodBy KEKA, a Verified Buyer from WA on September 24, 2026Good oilBottom LineYes, I would recommend this to a friend.Was this review helpful?
-
star rating
El mejor aceite que he usadoBy JONATAK, a Verified Buyer on September 23, 2026Recomendado 100%Bottom LineYes, I would recommend this to a friend.Was this review helpful?
-
star rating
best oilBy CHARLES, a Verified Buyer from FL on September 23, 2026been using g for years now. my wife even said what did you do to my car? it's running diffBottom 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.
-
-
-
star rating
Quality productsBy ERIC, a Verified Buyer from Wichita, KS on September 26, 2026Amsoil products are all that I will useBottom LineYes, I would recommend this to a friend.Was this review helpful?
-
star rating
Great oilBy THOMAS, a Verified Buyer from Montana on September 26, 2026Great oil, I believe it's great for my high mileage Lexus GX470.Bottom LineYes, I would recommend this to a friend.Was this review helpful?
-
star rating
Better shiftingBy CHUNG, a Verified Buyer from Rogers AR 72756 on September 26, 2026Best oil in my opinion....after changing amsoil transmission oil ...my Tundra shifting better than factoryBottom LineYes, I would recommend this to a friend.Was this review helpful?
-
star rating
The only choice!By NICHOLAS, a Verified Buyer from Rhode Island on September 25, 2026Been using this oil on my 2020 tundra since 25k now at 137,000. 2013 jeep compass and 2025 jeep compass. I have not had a single car or truck run better on anything else noise or performance wise.Bottom LineYes, I would recommend this to a friend.Was this review helpful?
-
star rating
Engine oil on my trucksBy Javier, a Verified Buyer from Texas on September 25, 2026I only use this oil none elseBottom LineYes, I would recommend this to a friend.Was this review helpful?
-
star rating
It worksBy ROBERT, a Verified Buyer on September 25, 2026Math works Preferred customer works Oil worksBottom LineYes, I would recommend this to a friend.Was this review helpful?
-
star rating
A must for GM 6.2By MARK, a Verified Buyer from Colorado on September 24, 2026My 2023 Sierra 6.2 used to knock on start up and now its super smooth. I also get better MPG vs the old full synthetic I used to run. A++Bottom LineYes, I would recommend this to a friend.Was this review helpful?
-
star rating
GoodBy KEKA, a Verified Buyer from WA on September 24, 2026Good oilBottom LineYes, I would recommend this to a friend.Was this review helpful?
-
star rating
El mejor aceite que he usadoBy JONATAK, a Verified Buyer on September 23, 2026Recomendado 100%Bottom LineYes, I would recommend this to a friend.Was this review helpful?
-
star rating
best oilBy CHARLES, a Verified Buyer from FL on September 23, 2026been using g for years now. my wife even said what did you do to my car? it's running diffBottom LineYes, I would recommend this to a friend.Was this review helpful?
-
star rating
