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Signature Series 0W-40 Synthetic Motor Oil

Product code : AZFQTC-EA

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, in ASTM D6891 as required by the API SN specification.
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.

  • 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, in ASTM D6891 as required by the API SN specification.
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.

Signature Series 0W-40 Synthetic Motor Oil



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 Simulator test

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

Signature Series Fights Wear – 75% more engine protection against horsepower loss and wear.

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.

Signature Series Delivers Powerful Protection – AMSOIL delivers powerful protection.  How good is it?  An independent lab compared AMSOIL synthetic motor oil head-t-head against a leading competitor in a 100,000-mile test.  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

Signature Series protects Against LSPI – AMSOIL Synthetic Motor oil achieved 100% protection against LSPI.

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

Signature Series resists viscosity increase – in industry-standard testing, it demonstrated only 0.1% viscosity increase.

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
Signature Series Cleans – AMSOIL Signature Series Synthetic Motor Oil has 50% more detergents to help keep oil passages clean and promote oil circulation.  It provides 90% better protection against 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.

Signature Series Guards Turbos – Protects turbochargers 72% better than required by the GM dexos1 Gen 2 specification.

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

AMSOIL Keeps Pistons Cleaner – Even after doubling the length of the industry-standard test.  AMSOIL delivered 40% cleaner pistons than required by the standard.

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.


Trusted by Professionals

Dedicated engine builders and mechanics put in long hours honing their craft. These architects of powerful, high-performance engines turn to Signature Series to protect their passion.

Hear what they have to say.

Barry Robotnick Testimonial


Wistia video thumbnail


Signature Series 0W-40 Synthetic Motor Oil

Data Bulletin

Warranty

SDS



Signature Series 0W-40 Synthetic Motor Oil

  • 5 star rating
    Best oil lab proven!
    By  STEPHEN,  a  Verified Buyer  from  Appalachian Mountains, NC  on  March 24, 2023
    I was a big fan of Motul and still am. I started sending my oil in for analysis thru Blackstone Laboratories and sure enough Motul was working well. Couldn't get Motul a couple years ago and needed an oil change so I grabbed some Amsoil. As always my oil went to the lab after 3,000 miles and was thoroughly surprised...Amsoil showed a higher viscosity in the same interval and with the same hard driving...track days etc. So I decided to stay with Amsoil a few more oil changes to make sure the results weren't just a one time deal. Sure enough every oil change, approximately every month and half, higher viscosity, better wear protection, wear metals dropped slightly. I haven't looked back since...Amsoil is my choice for all my vehicles with lab results that prove there's no better product to protect my hard driven STI, WRX and wife's Crosstrek. THANK YOU Amsoil!!!
    Bottom Line
    Yes, I would recommend this to a friend.
    Was this review helpful?
  • 5 star rating
    Great Product
    By  JC,  a  Verified Buyer  from  Torrance, Ca  on  March 23, 2023
    Have been using Amsoil products for years. This is no different, great product and great results. I have never had any issues using it.
    Bottom Line
    Yes, I would recommend this to a friend.
    Was this review helpful?
  • 5 star rating
    Great product
    By  MICHAEL,  a  Verified Buyer  from  Valley Springs, CA  on  March 22, 2023
    Love this oil. I use it in all three of my diesel pick ups.
    Bottom Line
    Yes, I would recommend this to a friend.
    Was this review helpful?
  • 5 star rating
    5w30
    By  PAUL,  a  Verified Buyer  from  York, Me  on  March 21, 2023
    Best oil on the market. I’ll never use anything else
    Bottom Line
    Yes, I would recommend this to a friend.
    Was this review helpful?
  • 5 star rating
    Excellent product
    By  JOHN,  a  Verified Buyer  on  March 21, 2023
    I've used Amsoil in multiple vehicles and in all weather conditions. I like it for cold starts and on extremely hot days. I would like to see more free shipping incentives (lower purchase amounts) and the prices are quite a bit higher than Mobil 1 extended life. You might lose some clients.
    Bottom Line
    Yes, I would recommend this to a friend.
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  • 5 star rating
    Awesome
    By  STEVE,  a  Verified Buyer  from  Nj  on  March 21, 2023
    Could not give any better of a review, ordered oil today received within 24 hours been a Amsoil user for 30 years never used any other oil
    Bottom Line
    Yes, I would recommend this to a friend.
    Was this review helpful?
  • 5 star rating
    Synthetic Is The Way
    By  CHAZZ,  a  Verified Buyer  from  Oahu  on  March 20, 2023
    I have successfully switched all my cars over to AMSOIL. I love that you have the option to order the oil change kits which come with the necessary amount of oil and the required filter. This takes the guessing out the oil change.
    Bottom Line
    Yes, I would recommend this to a friend.
    Was this review helpful?
  • 5 star rating
    Amsoil Signature Motor Oil
    By  JOHN,  a  Verified Buyer  from  Long Island, NY  on  March 20, 2023
    Been using this liquid gold for well over a decade, also the other products as well. The process to place an order as well as status email updates, swift delivery..what more can one ask? I feel like I am using the Best motor oil for my vehicles. The cost of this product has always come at a premium, unfortunately, it seems more so in recent times.
    Bottom Line
    Yes, I would recommend this to a friend.
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  • 5 star rating
    Best Oil Comes At HIghest Price!
    By  DOUGLAS,  a  Verified Buyer  from  Dumfries, VA  on  March 20, 2023
    Been with Amsoil for 14+ years and it's the best I've come across. However prices are getting out of hand and I'm wondering if it's becoming too high and the cost point isn't worth the improvement over other high performing motor oil brands that come at a fairly significant lower cost. Just not sure yet, but another price hike or two may just do it for me...
    Bottom Line
    Yes, I would recommend this to a friend.
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  • 5 star rating
    The best
    By  JIM,  a  Verified Buyer  from  OH  on  March 20, 2023
    It all started when I used their double filter system when I used to drive for work 30 years ago. I was putting around 3k miles a month on my vehicle and looking to cut back on oil changes. I've been a fan ever since.
    Bottom Line
    Yes, I would recommend this to a friend.
    Was this review helpful?