Skip to Main Content
Shop by Vehicle
Roll over image to zoom in

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, 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.

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.

 

Download Transcript >

 

Download Transcript >

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
    Best stuff on the world
    By  SAUL,  a  Verified Buyer  on  February 20, 2024
    This product is amazing I ran nothing but this on my 07 gt500.
    Bottom Line
    Yes, I would recommend this to a friend.
    Was this review helpful?
  • 5 star rating
    Superior products
    By  RONALD,  a  Verified Buyer  from  Phippsburg, Colorado  on  February 19, 2024
    I have used Amsoil products in my vehicles since 1980 I would not use any other procuct.
    Bottom Line
    Yes, I would recommend this to a friend.
    Was this review helpful?
  • 5 star rating
    Top motor oil
    By  JIM,  a  Verified Buyer  from  Claremont, NC  on  February 19, 2024
    I have well over 1,000,000 miles on cars and 300,000 miles on motorcycles since 1975 using Amsoil Synthetics. Never have any regrets or engine problems.
    Was this review helpful?
  • 5 star rating
    THE BEST for your vehicle period!!
    By  ALAN,  a  Verified Buyer  from  MN  on  February 19, 2024
    I have used with much success the Amsoil Signature Series 5W-30 in my Nissan Maxima and Nissan 370Z. Engine runs quieter, shifts through gears much smoother, smoother to shift and engine performance when pushed is top notch with little to no struggle. Engine oil and transmission temps run noticeably 10 degrees cooler under normal operation. Noticed all these differences after just two cycle changes with this oil. I purchased my Maxima brand new and it runs like the day I drove it off the lot. If you care about your vehicles, if you care about how they operate, if you want to drive them well past 200,000 miles, then Amsoil is your solution to get you there!
    Bottom Line
    Yes, I would recommend this to a friend.
    Was this review helpful?
  • 5 star rating
    Excellent Engine Protection
    By  DARYL,  a  Verified Buyer  on  February 18, 2024
    Amsoil is the Best and the only oil I use…
    Bottom Line
    Yes, I would recommend this to a friend.
    Was this review helpful?
  • 5 star rating
    Best oil in the market by far
    By  ERIC,  a  Verified Buyer  on  February 18, 2024
    Amaoil makes my angel run at a lower temperature saving fuel
    Bottom Line
    Yes, I would recommend this to a friend.
    Was this review helpful?
  • 5 star rating
    Great product
    By  VITALIY,  a  Verified Buyer  on  February 18, 2024
    Great product using 3 year's
    Bottom Line
    Yes, I would recommend this to a friend.
    Was this review helpful?
  • 5 star rating
    Trust AMSOIL
    By  JAMES,  a  Verified Buyer  from  Little Rock AR  on  February 18, 2024
    I have been using AMSOIL in my Harley for about 6 years; Harley touring bikes are air cooled, and summers in Arkansas can get pretty warm, so it is a good test for motors that get pretty hot. I am very picky about what oils I put in my vehicles. I have learned that if you take care of your engine your vehicle it will run better and chances are it will last longer. I just turned over 100,000 miles in my 2017 Lexus RX 350, and it still runs great. I have been using AMSOIL in it for about 3 years now. I still like to change my oil in the Lexus every 10,000 miles. I like going to the AMSOIL web site, find the best oil for my vehicle and click a few boxes and the oil is on my door step in a couple days. There are a lot of oils out there that you can use. I trust AMSOIL and will stick to what works. It's easy to see exactly what I used last time and just reorder when it comes time to change my oil. I like
    Bottom Line
    Yes, I would recommend this to a friend.
    Was this review helpful?
  • 5 star rating
    Backyard mechanic
    By  WARREN,  a  Verified Buyer  from  Boston   on  February 17, 2024
    I have a question do they make signature series for Audi BMW automobiles
    Bottom Line
    Yes, I would recommend this to a friend.
    Was this review helpful?
  • 5 star rating
    Outstanding Oil
    By  RON,  a  Verified Buyer  from  South Carolina  on  February 17, 2024
    I only use Signature Oil in three of my vehicles. I have had no lubrication related issues with any of my vehicles. Amsoil is the only product I will put in my normally aspirated and turbocharged engines.
    Bottom Line
    Yes, I would recommend this to a friend.
    Was this review helpful?