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AMSOIL Signature Series 5W-50 100% Synthetic Motor Oil
Product code : AMRQTC-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-50 100% Synthetic Motor Oil
Product code : AMRQTC-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:
$21.89
Retail Price (CAD)
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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
Availability of AMSOIL oil filters.By DANIEL, a Verified Buyer on July 14, 2026Everything is good with the exception of the availability AMSOIL oil filters.Bottom LineYes, I would recommend this to a friend.Was this review helpful?
-
star rating
very good oilBy DONALD, a Verified Buyer from birmingham ala. on July 14, 2026love this oilBottom LineYes, I would recommend this to a friend.Was this review helpful?
-
star rating
El mejorBy JOSE, a Verified Buyer from Houston TX on July 12, 2026Es el mejor aceite desde que lo cambie mi vehículo da mejor rendimiento mayor toque y más suaveBottom LineYes, I would recommend this to a friend.Was this review helpful?
-
star rating
Used in motorhomeBy DOUGLAS, a Verified Buyer from Richland Washington on July 12, 2026Great oil, engine actually sounds better and feels like it runs smoother.Bottom LineYes, I would recommend this to a friend.Was this review helpful?
-
star rating
Oil filterBy VINCENT, a Verified Buyer from Phoenix on July 12, 2026Love the products but only thing I have an issue with is the lack of stock on and oil filters! When I order a oil change kit I don’t want the wix filter if I wanted that I’d go to the local parts storeBottom LineYes, I would recommend this to a friend.Was this review helpful?
-
star rating
Best motor oil on the market!By ERIK, a Verified Buyer from Indiana on July 11, 2026I started using this oil in 2009 in a Toyota Avalon with 230k miles. That same car now has 456k miles and runs as smooth as a top! I run the oil for 20-25k miles, changing the filter in the middle of the interval. I would not put anything else in my vehicles!Bottom LineYes, I would recommend this to a friend.Was this review helpful?
-
star rating
Good stuff, but..By MATTHEW, a Verified Buyer from Simi Valley CA on July 11, 2026I have been told this oil is the best of the best. They say I can go 20k on an oil change. Do I trust that? Not really. But I try to use the best products that I can afford. Do I see or feel a difference? No. I just have to take their word on it.Bottom LineYes, I would recommend this to a friend.Was this review helpful?
-
star rating
Use the bestBy GEORGE, a Verified Buyer on July 11, 2026If you want the best. This is it. Engine runs betterBottom LineYes, I would recommend this to a friend.Was this review helpful?
-
star rating
AwesomeBy TROY, a Verified Buyer on July 10, 2026Best oil I’ve ever used. My vehicles love it too.Bottom LineYes, I would recommend this to a friend.Was this review helpful?
-
star rating
ConvincedBy STEVE, a Verified Buyer from Wadsworth, OH on July 09, 2026I use this in my Granddaughters Kia. She loves the fact of only one oil change a year. She is really busy with work and school . She does not want to be bothered a few months with an oil change!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.
-
-
-
star rating
Availability of AMSOIL oil filters.By DANIEL, a Verified Buyer on July 14, 2026Everything is good with the exception of the availability AMSOIL oil filters.Bottom LineYes, I would recommend this to a friend.Was this review helpful?
-
star rating
very good oilBy DONALD, a Verified Buyer from birmingham ala. on July 14, 2026love this oilBottom LineYes, I would recommend this to a friend.Was this review helpful?
-
star rating
El mejorBy JOSE, a Verified Buyer from Houston TX on July 12, 2026Es el mejor aceite desde que lo cambie mi vehículo da mejor rendimiento mayor toque y más suaveBottom LineYes, I would recommend this to a friend.Was this review helpful?
-
star rating
Used in motorhomeBy DOUGLAS, a Verified Buyer from Richland Washington on July 12, 2026Great oil, engine actually sounds better and feels like it runs smoother.Bottom LineYes, I would recommend this to a friend.Was this review helpful?
-
star rating
Oil filterBy VINCENT, a Verified Buyer from Phoenix on July 12, 2026Love the products but only thing I have an issue with is the lack of stock on and oil filters! When I order a oil change kit I don’t want the wix filter if I wanted that I’d go to the local parts storeBottom LineYes, I would recommend this to a friend.Was this review helpful?
-
star rating
Best motor oil on the market!By ERIK, a Verified Buyer from Indiana on July 11, 2026I started using this oil in 2009 in a Toyota Avalon with 230k miles. That same car now has 456k miles and runs as smooth as a top! I run the oil for 20-25k miles, changing the filter in the middle of the interval. I would not put anything else in my vehicles!Bottom LineYes, I would recommend this to a friend.Was this review helpful?
-
star rating
Good stuff, but..By MATTHEW, a Verified Buyer from Simi Valley CA on July 11, 2026I have been told this oil is the best of the best. They say I can go 20k on an oil change. Do I trust that? Not really. But I try to use the best products that I can afford. Do I see or feel a difference? No. I just have to take their word on it.Bottom LineYes, I would recommend this to a friend.Was this review helpful?
-
star rating
Use the bestBy GEORGE, a Verified Buyer on July 11, 2026If you want the best. This is it. Engine runs betterBottom LineYes, I would recommend this to a friend.Was this review helpful?
-
star rating
AwesomeBy TROY, a Verified Buyer on July 10, 2026Best oil I’ve ever used. My vehicles love it too.Bottom LineYes, I would recommend this to a friend.Was this review helpful?
-
star rating
ConvincedBy STEVE, a Verified Buyer from Wadsworth, OH on July 09, 2026I use this in my Granddaughters Kia. She loves the fact of only one oil change a year. She is really busy with work and school . She does not want to be bothered a few months with an oil change!Bottom LineYes, I would recommend this to a friend.Was this review helpful?
-
star rating
