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AMSOIL Signature Series 5W-30 100% Synthetic Motor Oil

Product code : ASLQT-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 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.

AMSOIL Signature Series 5W-30 100% 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 (Lower = Better)

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

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.

Test results from AMSOIL against leading competitor in 100,000-mile test.

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.

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

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.

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.

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.

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.

 

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AMSOIL Signature Series 5W-30 100% Synthetic Motor Oil

Data Bulletin

Warranty

SDS



AMSOIL Signature Series 5W-30 100% Synthetic Motor Oil

  • 5 star rating
    Smooth operator
    By  MICHAEL,  a  Verified Buyer  from  Canada   on  November 11, 2024
    Maybe this oil is more than we need in our Tacoma but for me it has always performed better than the rest. We stuck with Toyota's 0w20 Synthetic for the first couple oil changes and on the 3rd went to old faithful Signature Series and the difference was noticeable right out of the gate. Will SS completely change your engine performance probably not but in my opinion it will run smoother and allow it to operate at its peak potential. There are other good oils out there but for me Amsoil SS is the one I use and trust the most.
    Bottom Line
    Yes, I would recommend this to a friend.
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  • 5 star rating
    Best product
    By  JORDAN,  a  Verified Buyer  on  November 10, 2024
    My Lexus has over 243,000 miles- bought it with a little over 140,000. My last 5 oil changes I’ve used this (even though it’s guaranteed for over 20,000 miles I still change about every 5 or 6 thousand) my car runs way better than when I bought it. I also run the AMSoil gear fluid for differential and AMSoil transmission fluid. All original parts. Only engine components been replaced on car since I bought it is alternator and a couple of sensors. And this car had major carbon buildup when I bought it. It pays off in the long run to use the best products!
    Bottom Line
    Yes, I would recommend this to a friend.
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  • 4 star rating
    oils ok
    By  ROY,  a  Verified Buyer  from  Belleville   on  November 10, 2024
    Too bad they don't read the orders with the codes as the website wouldn't...shouldn't have to call...good oil tho
    Bottom Line
    Yes, I would recommend this to a friend.
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  • 5 star rating
    Cost effective except this time
    By  ROBERT,  a  Verified Buyer  on  November 10, 2024
    You shipped an extra gallon of signature and didn’t charge me for it. I called and paid the difference. The right thing to do. See midwestern values below. Unfortunately it fouls up my purchase agenda, and winds up being a little less cost effective for a year. Not a big deal. As I said, I use signature, and it lasts one year and cuts down on maintenance time. I’m loyal to Amsoil and intend to remain so because I see it as a superior product, and customer service offers a personal connection far exceeding what has become the norm. I think it’s midwestern values. But that’s just me. I grew up in Illinois.
    Bottom Line
    Yes, I would recommend this to a friend.
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  • 5 star rating
    Glad I made the Switch
    By  KESHAWN,  a  Verified Buyer  from  Va  on  November 09, 2024
    Amsoil has made my engine quieter, and improved my fuel economy. Very happy that I switched and I will be switching my differential fluid to Amsoil severe gear here soon as well.
    Bottom Line
    Yes, I would recommend this to a friend.
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  • 5 star rating
    Excellent Oil!
    By  MARIUS,  a  Verified Buyer  from  Tujunga CA   on  November 09, 2024
    On my 2006 Jeep Liberty with 88,000 Original Miles All other Conversational "Full Synthetic" engine oils made the engine have a tapping sound at start-up. But when I switched to the Amsoil the tapping sound stopped!! Been using it every since and will never use Conventional oils again!
    Bottom Line
    Yes, I would recommend this to a friend.
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  • 5 star rating
    Best oil.
    By  HAROLD,  a  Verified Buyer  from  BisMarck Mo.   on  November 09, 2024
    I like knowing I’m protecting my engine and two turbos! No valve train noise and chatter . I use Amsoil in all of my vehicles and motorcycles. You definitely get what you pay for!
    Bottom Line
    Yes, I would recommend this to a friend.
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  • 5 star rating
    Best stuff on the market
    By  DAVID,  a  Verified Buyer  from  Michigan   on  November 09, 2024
    Best diesel oil on the market we protect our feet with amsoil.
    Bottom Line
    Yes, I would recommend this to a friend.
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  • 5 star rating
    Best oil
    By  KIRSTEN,  a  Verified Buyer  from  Colorado  on  November 08, 2024
    I run only this in a higher performance engine
    Bottom Line
    Yes, I would recommend this to a friend.
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  • 5 star rating
    Whear protection
    By  JESSE,  a  Verified Buyer  from  idaho  on  November 08, 2024
    been using his product on my Silverado it has over 250000 miles on it and its running like new still best Whear protection I've ever had .
    Bottom Line
    Yes, I would recommend this to a friend.
    Was this review helpful?