☰
Product Image
AMSOIL Signature Series 0W-20 100% Synthetic Motor Oil
Product code : ASMQT-EA
AMSOIL Signature Series 0W-20 100% Synthetic Motor Oil
Product code : ASMQT-EA
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, Jun 24
to Columbus - 43215.
You are already subscribed to this product. As soon as the product appears in stock, we will notify you by email.
Added to Your Shopping Cart
-
A New Level of Motor Oil Technology
- 75% more engine protection against horsepower loss and wear.1
- 50% more cleaning power vs. AMSOIL OE Motor Oil
- Protects turbochargers 72% better than required2 by the GM dexos1 Gen 2 specification.
- 28% more acid-neutralizing power than Mobil 1.3
- Trusted by professional engine builders
- Guaranteed protection for up to 25,000 miles or 1 year
1Based on independent testing of AMSOIL Signature Series 0W-20 using the ASTM D6891 standard test.
2Based on independent testing of AMSOIL Signature Series 5W-30 in the GM turbo coking test.
3Based upon independent testing of Mobil 1 Annual Protection Full Synthetic 5W-30 and AMSOIL Signature Series 5W-30 in ASTM D2896. Oils purchased in July 2020. -
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.
About this item
-
Engineered for enthusiasts seeking maximum protection and performance. Precision-formulated with cutting-edge technology and a longstanding devotion to making the world’s best motor oil. The result: engine protection that blows the doors off the highest industry standards.
See the Product Data Bulletin for full details.
Fights Engine Wear
- 75 percent more engine protection against horsepower loss and wear1 than required by the industry standard, extending the life of vital components like pistons and cams.
- Develops a strong fluid film that keeps metal surfaces separated.
- Robust anti-wear additives further reduce wear in metal-to-metal contact regions for maximum engine life.
1Based on independent testing of AMSOIL Signature Series 0W-20, in ASTM D6891 as required by the API SN specification.
Signature Series Improves Startup Protection
AMSOIL provides better cold cranking viscosity, helping improve wear protection for engine components at startup.PP
ASTM D5293 cold Crank (Lower = Better)
AMSOIL Signature Series(5W-30) Royal Purple High Performance (5W-30) Lucas (5W-30) Driven LS30 (5W-30) Red Line High Performance (5W-30) Royal Purple HPS (5W-30) Cranking Viscosity (㎫ —s) 3800 4500 5000 5750 6100 6100 PPBased on independent third-party testing in the industry-standard ASTM D5293 Cold Crank Simulator test as required by SAE J300.
*Trademark names and images are the property of their respective owners and may be registered marks in some countries. No affiliation or endorsement claim, express or implied, is made by their use.
Signature Series Fights Wear
75% more engine protection against horsepower loss and wear.A
Sequence IVA Engine Test - Lower Number = Less Wear
Industry Standard AMSOIL Signature Series 0W-20 Synthetic Motor Oil Average Cam Wear 90 20.28 ABased on independent testing of AMSOIL Signature Series 0W-20, in ASTM D6891 as required by the API SN specification.
Signature Series Delivers Powerful Protection
AMSOIL delivers powerful protection. How good is it? An independent lab compared AMSOIL synthetic motor oil head-to-head against a leading competitor in a 100,000-mile test.P AMSOIL provided far superior wear protection and kept bearings looking like new.
PTesting conducted in an independent lab using AMSOIL Signature Series 5W-30 Synthetic Motor Oil and a leading synthetic-blend 5W-30 motor oil in Ford F-150 trucks with 3.5L twin-turbo engines.
Signature Series Protects Against LSPI
AMSOIL Synthetic Motor Oils achieved 100% protection against LSPI.B
![Piston damage due to an LSPI event observed during the testing of a competitor's motor oil.]( "Piston damage due to an LSPI event observed during the testing of a competitor's motor oil.")
Example of piston damage due to an LSPI event observed during the testing of a competitor’s motor oil. The red arrows indicate sections of the ring land that have broken away from the piston.
BBased on zero LSPI events in five consecutive tests of AMSOIL Signature Series, XL and OE 5W-30 Motor Oil in the LSPI engine test required by the GM dexos1 Gen 2 specification.
Signature Series Resists Viscosity Increase
Signature Series is barely challenged by the industry-standard testing, demonstrating only a 0.1% viscosity increase. Even when the test length is doubled, AMSOIL delivered twice the viscosity control required by the standard.GG
Sequence IIIH Engine Test - Lower number = better viscosity control
Industry Standard AMSOIL 1X AMSOIL 2X Viscosity Increase % 100% 0.1% 49.6% GGBased on independent testing of AMSOIL Signature Series 5W-30 in the Sequence IIIH Engine Test (ASTM D8111), required by the ILSAC GF-6 and API SP specifications.
Signature Series Helps Keep Engines Cleaner
- Fortified with a heavy treatment of detergent additives, delivering 28% more acid-neutralizing power than Mobil 1* and helping engines stay cleaner, longer.LL
- 50% more detergentsD to help keep oil passages clean and promote oil circulation.
- Controls heat and minimizes performance-robbing deposits.
- Superior thermal durability that resists breakdown and keeps pistons clean.
- Provides 90% better protection against sludge.DD
![Oil pick-up tube screen showing it's virtually free of sludge.]( "Oil pick-up tube screen showing it's virtually free of sludge.")
The oil pick-up tube screen is virtually free of sludge.
LLBased upon independent testing of Mobil 1 Annual Protection Full Synthetic 5W-30 and AMSOIL Signature Series 5W-30 in ASTM D2896. Oils purchased July 2020.
Dvs. AMSOIL OE Motor Oil
DDBased on independent testing of AMSOIL Signature Series 5W-30 in the ASTM D6593 engine test for oil screen plugging as required by the API SN specification.
Signature Series Guards Turbos
Protects turbochargers 72% better than requiredC by the GM dexos1* Gen 2 specification.
![Part from turbocharger.]( "Part from turbocharger.")
CBased on independent testing of AMSOIL Signature Series 5W-30 in the GM turbo coking test.
Keeps Pistons Cleaner
Even after doubling the length of the industry-standard test, AMSOIL delivered 40% cleaner pistons than required by the standard.FF
![Piston 40% cleaner from using AMSOIL.]( "Piston 40% cleaner from using AMSOIL.")
FFBased on independent testing of AMSOIL Signature Series 5W-30 in the Sequence IIIH Engine Test (ASTM D8111), required by the ILSAC GF-6 and API SP specifications.
-
Performance Studies
Data Bulletin
Warranty
SDS
-
-
star rating
#1 trusted synthetic oilBy MATT, a Verified Buyer on June 19, 2026I don’t use anything but AMSOIL in my vehicles. Soon as they are broke in they get a fresh AMSOIL change and stay that way. Thank you for such an amazing product.Bottom LineYes, I would recommend this to a friend.Was this review helpful?
-
star rating
signature series 5w30By CASEY, a Verified Buyer from NJ on June 19, 2026oil quality is excellent as expected. and honestly, the gallon jug is a fantastic size! much easier to handle than a 5 quart. I'll be ordering another 4 pack in the future!Bottom LineYes, I would recommend this to a friend.Was this review helpful?
-
star rating
Customer since 1971By Ronomundo, a Verified Buyer from Heber Springs, Arkansas on June 19, 2026I've been very pleased with AMSOIL Signature Series motor oil. It has performed exceptionally well in my vehicles, and I appreciate the confidence it gives me in long-term engine protection. I also use AMSOIL fuel treatment products and have experienced smoother operation and dependable performance. Based on my experience, AMSOIL has earned my trust and recommendation.Bottom LineYes, I would recommend this to a friend.Was this review helpful?
-
star rating
ConfidenceBy PHILIP, a Verified Buyer from Central Pennsylvania on June 19, 2026AMSOIL was recommended to me by my dealers Honda Certified Master Technician who services both our cars. He personally uses it and with all the reputational history I’m confident we’re using the best.Bottom LineYes, I would recommend this to a friend.Was this review helpful?
-
star rating
OilBy CHARLES, a Verified Buyer from Tifton on June 17, 2026The filter wrench was awesome This is my first time using this product Everything arrived on time and in perfect conditionBottom LineYes, I would recommend this to a friend.Was this review helpful?
-
star rating
Engine oilBy STEPHAN, a Verified Buyer from Sudbury Ontario Canada on June 17, 2026The oil holds up very well in my Escalade!Bottom LineYes, I would recommend this to a friend.Was this review helpful?
-
star rating
On timeBy TIM, a Verified Buyer from Virginia on June 17, 2026Timely delivery on quality product.Bottom LineYes, I would recommend this to a friend.Was this review helpful?
-
star rating
Good oilBy DAVID, a Verified Buyer from Tennessee on June 16, 2026As good as oil can get. I’ll never see the difference vs regular oil, but makes me feel better having a superior product.Bottom LineYes, I would recommend this to a friend.Was this review helpful?
-
star rating
Best engine oil I know ofBy JEFFREY, a Verified Buyer from Long Beach, CA on June 16, 2026Started using Amsoil SS and Amsoil filters on my car about 2 years ago. The next oil change after switching to Amsoil, I know longer get any fine metal glitter on my drain plug magnet and haven't since. That's proof to me that it works! I now use Amsoil in everything I own that has an engine.Bottom LineYes, I would recommend this to a friend.Was this review helpful?
-
star rating
Highly satisfiedBy BRYAN, a Verified Buyer on June 15, 2026185000 miles on a chevy suv and no signs of any issuesBottom LineYes, I would recommend this to a friend.Was this review helpful?
-
star rating
Compare Motor Oil
Las Vegas Taxi Cab Field Study-
A New Level of Motor Oil Technology
- 75% more engine protection against horsepower loss and wear.1
- 50% more cleaning power vs. AMSOIL OE Motor Oil
- Protects turbochargers 72% better than required2 by the GM dexos1 Gen 2 specification.
- 28% more acid-neutralizing power than Mobil 1.3
- Trusted by professional engine builders
- Guaranteed protection for up to 25,000 miles or 1 year
1Based on independent testing of AMSOIL Signature Series 0W-20 using the ASTM D6891 standard test.
2Based on independent testing of AMSOIL Signature Series 5W-30 in the GM turbo coking test.
3Based upon independent testing of Mobil 1 Annual Protection Full Synthetic 5W-30 and AMSOIL Signature Series 5W-30 in ASTM D2896. Oils purchased in July 2020. -
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.
-
Engineered for enthusiasts seeking maximum protection and performance. Precision-formulated with cutting-edge technology and a longstanding devotion to making the world’s best motor oil. The result: engine protection that blows the doors off the highest industry standards.
See the Product Data Bulletin for full details.
Fights Engine Wear
- 75 percent more engine protection against horsepower loss and wear1 than required by the industry standard, extending the life of vital components like pistons and cams.
- Develops a strong fluid film that keeps metal surfaces separated.
- Robust anti-wear additives further reduce wear in metal-to-metal contact regions for maximum engine life.
1Based on independent testing of AMSOIL Signature Series 0W-20, in ASTM D6891 as required by the API SN specification.
Signature Series Improves Startup Protection
AMSOIL provides better cold cranking viscosity, helping improve wear protection for engine components at startup.PP
ASTM D5293 cold Crank (Lower = Better)
AMSOIL Signature Series(5W-30) Royal Purple High Performance (5W-30) Lucas (5W-30) Driven LS30 (5W-30) Red Line High Performance (5W-30) Royal Purple HPS (5W-30) Cranking Viscosity (㎫ —s) 3800 4500 5000 5750 6100 6100 PPBased on independent third-party testing in the industry-standard ASTM D5293 Cold Crank Simulator test as required by SAE J300.
*Trademark names and images are the property of their respective owners and may be registered marks in some countries. No affiliation or endorsement claim, express or implied, is made by their use.
Signature Series Fights Wear
75% more engine protection against horsepower loss and wear.A
Sequence IVA Engine Test - Lower Number = Less Wear
Industry Standard AMSOIL Signature Series 0W-20 Synthetic Motor Oil Average Cam Wear 90 20.28 ABased on independent testing of AMSOIL Signature Series 0W-20, in ASTM D6891 as required by the API SN specification.
Signature Series Delivers Powerful Protection
AMSOIL delivers powerful protection. How good is it? An independent lab compared AMSOIL synthetic motor oil head-to-head against a leading competitor in a 100,000-mile test.P AMSOIL provided far superior wear protection and kept bearings looking like new.
PTesting conducted in an independent lab using AMSOIL Signature Series 5W-30 Synthetic Motor Oil and a leading synthetic-blend 5W-30 motor oil in Ford F-150 trucks with 3.5L twin-turbo engines.
Signature Series Protects Against LSPI
AMSOIL Synthetic Motor Oils achieved 100% protection against LSPI.B
![Piston damage due to an LSPI event observed during the testing of a competitor's motor oil.]( "Piston damage due to an LSPI event observed during the testing of a competitor's motor oil.")
Example of piston damage due to an LSPI event observed during the testing of a competitor’s motor oil. The red arrows indicate sections of the ring land that have broken away from the piston.
BBased on zero LSPI events in five consecutive tests of AMSOIL Signature Series, XL and OE 5W-30 Motor Oil in the LSPI engine test required by the GM dexos1 Gen 2 specification.
Signature Series Resists Viscosity Increase
Signature Series is barely challenged by the industry-standard testing, demonstrating only a 0.1% viscosity increase. Even when the test length is doubled, AMSOIL delivered twice the viscosity control required by the standard.GG
Sequence IIIH Engine Test - Lower number = better viscosity control
Industry Standard AMSOIL 1X AMSOIL 2X Viscosity Increase % 100% 0.1% 49.6% GGBased on independent testing of AMSOIL Signature Series 5W-30 in the Sequence IIIH Engine Test (ASTM D8111), required by the ILSAC GF-6 and API SP specifications.
Signature Series Helps Keep Engines Cleaner
- Fortified with a heavy treatment of detergent additives, delivering 28% more acid-neutralizing power than Mobil 1* and helping engines stay cleaner, longer.LL
- 50% more detergentsD to help keep oil passages clean and promote oil circulation.
- Controls heat and minimizes performance-robbing deposits.
- Superior thermal durability that resists breakdown and keeps pistons clean.
- Provides 90% better protection against sludge.DD
![Oil pick-up tube screen showing it's virtually free of sludge.]( "Oil pick-up tube screen showing it's virtually free of sludge.")
The oil pick-up tube screen is virtually free of sludge.
LLBased upon independent testing of Mobil 1 Annual Protection Full Synthetic 5W-30 and AMSOIL Signature Series 5W-30 in ASTM D2896. Oils purchased July 2020.
Dvs. AMSOIL OE Motor Oil
DDBased on independent testing of AMSOIL Signature Series 5W-30 in the ASTM D6593 engine test for oil screen plugging as required by the API SN specification.
Signature Series Guards Turbos
Protects turbochargers 72% better than requiredC by the GM dexos1* Gen 2 specification.
![Part from turbocharger.]( "Part from turbocharger.")
CBased on independent testing of AMSOIL Signature Series 5W-30 in the GM turbo coking test.
Keeps Pistons Cleaner
Even after doubling the length of the industry-standard test, AMSOIL delivered 40% cleaner pistons than required by the standard.FF
![Piston 40% cleaner from using AMSOIL.]( "Piston 40% cleaner from using AMSOIL.")
FFBased on independent testing of AMSOIL Signature Series 5W-30 in the Sequence IIIH Engine Test (ASTM D8111), required by the ILSAC GF-6 and API SP specifications.
-
Performance Studies
Data Bulletin
Warranty
SDS
-
-
star rating
#1 trusted synthetic oilBy MATT, a Verified Buyer on June 19, 2026I don’t use anything but AMSOIL in my vehicles. Soon as they are broke in they get a fresh AMSOIL change and stay that way. Thank you for such an amazing product.Bottom LineYes, I would recommend this to a friend.Was this review helpful?
-
star rating
signature series 5w30By CASEY, a Verified Buyer from NJ on June 19, 2026oil quality is excellent as expected. and honestly, the gallon jug is a fantastic size! much easier to handle than a 5 quart. I'll be ordering another 4 pack in the future!Bottom LineYes, I would recommend this to a friend.Was this review helpful?
-
star rating
Customer since 1971By Ronomundo, a Verified Buyer from Heber Springs, Arkansas on June 19, 2026I've been very pleased with AMSOIL Signature Series motor oil. It has performed exceptionally well in my vehicles, and I appreciate the confidence it gives me in long-term engine protection. I also use AMSOIL fuel treatment products and have experienced smoother operation and dependable performance. Based on my experience, AMSOIL has earned my trust and recommendation.Bottom LineYes, I would recommend this to a friend.Was this review helpful?
-
star rating
ConfidenceBy PHILIP, a Verified Buyer from Central Pennsylvania on June 19, 2026AMSOIL was recommended to me by my dealers Honda Certified Master Technician who services both our cars. He personally uses it and with all the reputational history I’m confident we’re using the best.Bottom LineYes, I would recommend this to a friend.Was this review helpful?
-
star rating
OilBy CHARLES, a Verified Buyer from Tifton on June 17, 2026The filter wrench was awesome This is my first time using this product Everything arrived on time and in perfect conditionBottom LineYes, I would recommend this to a friend.Was this review helpful?
-
star rating
Engine oilBy STEPHAN, a Verified Buyer from Sudbury Ontario Canada on June 17, 2026The oil holds up very well in my Escalade!Bottom LineYes, I would recommend this to a friend.Was this review helpful?
-
star rating
On timeBy TIM, a Verified Buyer from Virginia on June 17, 2026Timely delivery on quality product.Bottom LineYes, I would recommend this to a friend.Was this review helpful?
-
star rating
Good oilBy DAVID, a Verified Buyer from Tennessee on June 16, 2026As good as oil can get. I’ll never see the difference vs regular oil, but makes me feel better having a superior product.Bottom LineYes, I would recommend this to a friend.Was this review helpful?
-
star rating
Best engine oil I know ofBy JEFFREY, a Verified Buyer from Long Beach, CA on June 16, 2026Started using Amsoil SS and Amsoil filters on my car about 2 years ago. The next oil change after switching to Amsoil, I know longer get any fine metal glitter on my drain plug magnet and haven't since. That's proof to me that it works! I now use Amsoil in everything I own that has an engine.Bottom LineYes, I would recommend this to a friend.Was this review helpful?
-
star rating
Highly satisfiedBy BRYAN, a Verified Buyer on June 15, 2026185000 miles on a chevy suv and no signs of any issuesBottom LineYes, I would recommend this to a friend.Was this review helpful?
-
star rating
