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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, Aug 26
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
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
AWESOMEBy ALBERT, a Verified Buyer from PA on August 22, 2026I always and only use AMSOIL in all my vehicles. It's a really good product; I'd recommend it to everyone.Bottom LineYes, I would recommend this to a friend.Was this review helpful?
-
star rating
AWESOMEBy ALBERT, a Verified Buyer from PA on August 22, 2026I always and only use AMSOIL in all my vehicles. It's a really good product; I'd recommend it to everyone.Bottom LineYes, I would recommend this to a friend.Was this review helpful?
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star rating
AMSOIL Signature Series 5W-30 100% Synthetic Motor OilBy MOMOTAKA, a Verified Buyer from CA on August 21, 2026Fast delivery, this is my 3rd oil change with it. I love the product.Was this review helpful?
-
star rating
Trusted ProductBy GREGORY, a Verified Buyer from Marietta, OH on August 21, 2026Once you have used this product, you will never settle for anything less and you will waste time searching for anything better!Bottom LineYes, I would recommend this to a friend.Was this review helpful?
-
star rating
Great PerformanceBy STEPHEN, a Verified Buyer from Oregon on August 21, 2026I have been using this product on my 2017 Subaru when I first purchased it brand new. This is an excellent quality product motor has always run smoothly and without any problems.Bottom LineYes, I would recommend this to a friend.Was this review helpful?
-
star rating
OW20By ELCAN, a Verified Buyer from Richmond Hill on August 21, 2026Engine runs quieter and has improved performance and gas mileage compared to Mobil 1Bottom LineYes, I would recommend this to a friend.Was this review helpful?
-
star rating
Mopar 5.7 literBy COLTON, a Verified Buyer from Missouri on August 21, 2026Have been using the same oil in my wife’s Durango for years it’s a 5.7 liter just had head off at 183000 for a lifter inside of engine was very clean. The 5.7 has always ran smooth with the oil as well I use to trade cars so soon it didn’t mater to me but now days we keep them .Bottom LineYes, I would recommend this to a friend.Was this review helpful?
-
star rating
Amsoil Synthetic 0W20By DON, a Verified Buyer from Goderich on August 20, 2026Amsoil synthetic 0W20 is the best oil iI have ever used. My first break in oil change was fantastic with virtually no metal on the magnetic drain plug and filter. I have changed it again at 3000 kilometers with the same result. Highly fecomended as a kit with WIX filter.Bottom LineYes, I would recommend this to a friend.Was this review helpful?
-
star rating
Excellent oil!!By MARK, a Verified Buyer from Elkhorn, Wisconsin on August 19, 2026I have used only Amsoil for years!! Highly recommend to everyone!!Bottom LineYes, I would recommend this to a friend.Was this review helpful?
-
star rating
Great oil I have used for years!!By MARK, a Verified Buyer from Elkhorn, Wisconsin on August 19, 2026This is great oil and well worth the money!! There is no oil made like Amsoil!!Bottom 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
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
AWESOMEBy ALBERT, a Verified Buyer from PA on August 22, 2026I always and only use AMSOIL in all my vehicles. It's a really good product; I'd recommend it to everyone.Bottom LineYes, I would recommend this to a friend.Was this review helpful?
-
star rating
AWESOMEBy ALBERT, a Verified Buyer from PA on August 22, 2026I always and only use AMSOIL in all my vehicles. It's a really good product; I'd recommend it to everyone.Bottom LineYes, I would recommend this to a friend.Was this review helpful?
-
star rating
AMSOIL Signature Series 5W-30 100% Synthetic Motor OilBy MOMOTAKA, a Verified Buyer from CA on August 21, 2026Fast delivery, this is my 3rd oil change with it. I love the product.Was this review helpful?
-
star rating
Trusted ProductBy GREGORY, a Verified Buyer from Marietta, OH on August 21, 2026Once you have used this product, you will never settle for anything less and you will waste time searching for anything better!Bottom LineYes, I would recommend this to a friend.Was this review helpful?
-
star rating
Great PerformanceBy STEPHEN, a Verified Buyer from Oregon on August 21, 2026I have been using this product on my 2017 Subaru when I first purchased it brand new. This is an excellent quality product motor has always run smoothly and without any problems.Bottom LineYes, I would recommend this to a friend.Was this review helpful?
-
star rating
OW20By ELCAN, a Verified Buyer from Richmond Hill on August 21, 2026Engine runs quieter and has improved performance and gas mileage compared to Mobil 1Bottom LineYes, I would recommend this to a friend.Was this review helpful?
-
star rating
Mopar 5.7 literBy COLTON, a Verified Buyer from Missouri on August 21, 2026Have been using the same oil in my wife’s Durango for years it’s a 5.7 liter just had head off at 183000 for a lifter inside of engine was very clean. The 5.7 has always ran smooth with the oil as well I use to trade cars so soon it didn’t mater to me but now days we keep them .Bottom LineYes, I would recommend this to a friend.Was this review helpful?
-
star rating
Amsoil Synthetic 0W20By DON, a Verified Buyer from Goderich on August 20, 2026Amsoil synthetic 0W20 is the best oil iI have ever used. My first break in oil change was fantastic with virtually no metal on the magnetic drain plug and filter. I have changed it again at 3000 kilometers with the same result. Highly fecomended as a kit with WIX filter.Bottom LineYes, I would recommend this to a friend.Was this review helpful?
-
star rating
Excellent oil!!By MARK, a Verified Buyer from Elkhorn, Wisconsin on August 19, 2026I have used only Amsoil for years!! Highly recommend to everyone!!Bottom LineYes, I would recommend this to a friend.Was this review helpful?
-
star rating
Great oil I have used for years!!By MARK, a Verified Buyer from Elkhorn, Wisconsin on August 19, 2026This is great oil and well worth the money!! There is no oil made like Amsoil!!Bottom LineYes, I would recommend this to a friend.Was this review helpful?
-
star rating
