AMSOIL Signature Series 5W-20 Synthetic Motor Oil
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Signature Series 5W-20 Synthetic Motor OilHelp

A New Level of Motor Oil Technology

Signature Series 5W-20 Synthetic Motor Oil Product Image
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$12.05 Retail Price (USD)
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Product Code: ALMQT-EA
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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.

• 50% more cleaning power vs. AMSOIL OE Motor Oil
• Ideal for turbos & direct injection
• Guaranteed protection for up to 25,000 miles or 1 year

Protects Against Engine Wear
AMSOIL Signature Series Synthetic Motor Oil develops a strong fluid film that keeps metal surfaces separated while its robust anti-wear additives further reduce wear in metal-to-metal contact regions for maximum engine life. The Sequence IVA Engine Test, which must be passed to meet the industry-standard API SN specification, simulates extended periods of stop-and-go driving. For 100 hours, the test engine cycles between 50 minutes of idling and 10 minutes of elevated rpm – conditions that encourage engine wear. The camshaft is then measured for wear in 84 locations and an average score is determined. We used Signature Series 0W-20, the lightest viscosity in the line, to further increase the severity of the test. AMSOIL Signature Series Synthetic Motor Oil provided 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.

After rigorous third-party testing, the cam lobes show little-to-no wear.
Cam lobes
SEQUENCE IVA ENGINE TEST
Lower number = less wear
SEQUENCE IVA ENGINE TEST

1Based on independent testing of AMSOIL Signatur e Series 0W-20, in ASTM D6891 as required by the API SN specification.

Protects Pistons from Low-Speed Pre-Ignition
We armed Signature Series with an advanced detergent system that protects against harmful deposits and low-speed pre-ignition (LSPI). Most new engines feature gasoline direct injection (GDI), often combined with a turbocharger to boost power and improve fuel economy. These new technologies, when combined with a poorly formulated motor oil, promote LSPI and threaten engine operation. LSPI is the spontaneous ignition of the fuel/air mixture prior to spark-triggered ignition. It occurs in today's advanced engines and is much more destructive than typical pre-ignition.

Original equipment manufacturers (OEMs) like GM* have addressed the issue by designing tests to determine a motor oil's ability to prevent LSPI. The GM test allows up to five LSPI events to receive a passing score. Signature Series Synthetic Motor Oil provided 100 percent protection against LSPI1 – zero occurrences were recorded.

Protects Turbochargers
Our unique synthetic formulation is inherently stable to resist oxidation and neutralize acids. Signature Series Motor Oil provides outstanding protection against deposits common to high-temperature engine environments. The tremendous heat and stress turbos create can cause some oils to break down and form harmful bearing deposits through a process known as turbo coking. Over time, turbos can suffer reduced performance or fail altogether.

We challenged Signature Series to the GM Turbo Coking Test, which consists of 2000 cycles of extreme heat soaks. An oil must limit the temperature change within the turbocharger to 13 percent or less to pass the test. Signature Series limited the temperature increase to only 3.6 percent, protecting theturbocharger 72 percent better than required2 by the GM dexos1® Gen 2 specification.

Piston damage and shaft wear

Up To 25,000 Miles Protection

Extends Drains: Protection Guaranteed
AMSOIL Signature Series Synthetic Motor Oil provides reserve protection, allowing you to go longer between oil changes if you choose – up to 25,000 miles, 700 hours of operation or one year, whichever comes first*. Our unique synthetic formulation and long-drain additive system are inherently stable to resist oxidation and neutralize acids over longer periods. Signature Series is designed to deliver outstanding engine protection, cleanliness and performance over extended drain intervals – guaranteed. It provides peace of mind so you can fit oil changes into your schedule.

1 Based on independent testing of AMSOIL Signature Series 5w-30 motor oil, in the LSPI engine test as required for the GM dexos 1® Gen 2 specification.
2 Based on independent testing of AMSOIL Signature Series 5W-30 in the GM turbo coking test.
3 vs. AMSOIL OE Motor Oil
4 Based 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.
* All trademarked 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. All products advertised here are developed by AMSOIL for use in the applications shown.

Preserves Horsepower
The extreme durability of Signature Series Motor Oil ensures your engine runs stronger, for longer. We installed Signature Series 5W-30 Synthetic Motor Oil in a Ford* F-150 with a new 3.5L Ecoboost engine to test its ability to protect turbocharged direct-injection (TDGI) engines from torque and horsepower loss during extended drain intervals up to 25,000 miles. Power sweeps were done at the beginning and end of the test to evaluate horsepower and torque retention. As the graph shows, Signature Series helped maintain engine performance throughout the 100,000 mile test.

Preserves Horsepower

Limits Oil Consumption
Signature Series has a uniform molecular structure that limits evaporation and keeps it where it's needed most – protecting your engine. Volatility (burn-off) occurs when oil gets hot, causing lighter molecules to burn off or evaporate. This leads to oil thickening, additive imbalance, higher emissions and oil consumption. The NOACK Volatility test is the industry standard for evaluating motor oil high temperature evaporation. It measures the percentage of burn-off after a motor oil is placed under constant airflow at 482ºF for 1 hour. A lower number indicates a better resistance to evaporation. Signature Series falls far below the API limit for volatility, reducing the need for frequent oil top-offs and limiting vehicle emissions.

Limits Oil Consumption

Easier Cold-Starts
Signature Series Synthetic Motor Oil does not contain paraffins (wax) and stays fluid in temperatures of -58ºF and lower. Extreme cold causes other motor oils to thicken, starving vital moving parts of lubrication, accelerating wear and even preventing vehicles from starting. Signature Series provides 66 percent better cold-temperature performance for easier starting, better fuel economy, improved oil flow (as seen below) and reduced wear.

Easier Cold-Starts

Cold Pour Test

Maintains Protective Viscosity
We formulated Signature Series with superior thermal durability that resists breakdown better than conventional and synthetic motor oils. The Sequence IIIH Test uses the Chrysler 3.6L Pentastar engine to evaluate a motor oil's ability to resist the damaging effects of heat. The test is conducted with oil temperatures of 304ºF, 100ºF hotter than normal operation, to accelerate oil thickening and deposits. Despite the extreme conditions, Signature Series kept pistons clean and held thickening to only 6 percent, a minimal amount compared to the proposed specification limit of 150 percent.1 This stay-in-grade performance helps maintain maximum power and fuel economy while also ensuring advanced technologies like variable valve timing (VVT) operate as designed throughout the entire drain interval.

Maintains Protective Viscosity

Keeps pistons clean

1 Based on proposed ILSAC GF-5 Plus specification.
* All trademarked 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. All products advertised here are developed by AMSOIL for use in the applications shown.

ALM Package Sizes
Code Package Size Unit of Measure Product
ALMQT (ALMQT-EA) Quart Each Signature Series 5W-20 Synthetic Motor Oil
ALMQT (ALMQT-CA) Quart Case of 12 Signature Series 5W-20 Synthetic Motor Oil
ALM1G (ALM1G-EA) Gallon Each Signature Series 5W-20 Synthetic Motor Oil
ALM1G (ALM1G-CA) Gallon Case of 4 Signature Series 5W-20 Synthetic Motor Oil
ALM30 (ALM30-EA) 30-Gallon Drum Each Signature Series 5W-20 Synthetic Motor Oil
ALM55 (ALM55-EA) 55-Gallon Drum Each Signature Series 5W-20 Synthetic Motor Oil
ALM27 (ALM27-EA) 275-Gallon Tote Each Signature Series 5W-20 Synthetic Motor Oil
More about AMSOIL Reviews

REVIEW SNAPSHOT®

by PowerReviews
AMSOILSignature Series 5W-30 Synthetic Motor Oil
 
5.0

(based on 994 reviews)

Ratings Distribution

  • 5 Stars

     

    (964)

  • 4 Stars

     

    (23)

  • 3 Stars

     

    (2)

  • 2 Stars

     

    (2)

  • 1 Stars

     

    (3)

99%

of respondents would recommend this to a friend.

Pros

No Pros

Cons

No Cons

Best Uses

No Best Uses
    • Was this a gift?:
    • No (4)

Most Liked Positive Review

 

Great Motor Oil

I've been using this Signature Series 5w-30 for the 12 years know in the same 1997 Toyota Tacoma 4x4 and it's never ran better. The motor is still like new with 397000 km...Read complete review

I've been using this Signature Series 5w-30 for the 12 years know in the same 1997 Toyota Tacoma 4x4 and it's never ran better. The motor is still like new with 397000 km on it. I do one oil change per year and that it. I'm a probably a slightly more aggressive driver compared to most and this oil is far superior to just about anything that I've come across. I defiantly put it through its paces and its never let me down. I hate to admit this but I even got in an accident once and went to exchange drivers information with the other guy with my truck running and noticed my antifreeze had all drained out from the accident. When I tried to get back into my truck my door wouldn't open even though it was unlocked. For over a half an hour my truck was running with no coolant and no way to shut off my truck. I kept an eye on the temperature gauge the whole time I was trying to get into my truck and the temperature remained in the normal operating temperature the entire time! I thought for sure it was going to cook the engine and I was ready to smash the window open if I seen the engine temperature rising. I finally gained access inside my truck and even drove it home {about 10 km} still without any coolant and the temperature never ever did go up! I give full credit to Amsoil for saving my engine and making a motor oil like no other! That was all about 200,000 km ago.

VS

Most Liked Negative Review

 

Not worth the hoops you have to jump through

The oil is good, but with the membership fee and high shipping costs I am going back to Mobile 1 as I did not see much if any of a difference. There is just...Read complete review

The oil is good, but with the membership fee and high shipping costs I am going back to Mobile 1 as I did not see much if any of a difference. There is just to many hoops they make you jump through. There should just be a cost to buy it and no membership fee that AMS Oil makes people think they are locked in to buying oil from them so they can "get the most of the membership". I think most people find annoying and just go buy another oil rather than pay high prices on top of shipping and also a fee just to buy it at a reasonable price.

Reviewed by 994 customers

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5.0

Good Stuff

By 

from Battle Creek

Verified Buyer

Comments about Signature Series 5W-30 Synthetic Motor Oil:

My dad has used AmsOil for close to 40 years. I just switched about 6 Months ago. I use it in all of my vehicles including my Work van that i use to pull a 5000lb trailer and is on the road all the time, stop and go!

  • How would you describe yourself?:
  • I'm a DIY handyman
  • What kind of vehicle/equipment do you have?:
  • Ford E-150, Chevy Silverado 2500, Buick
 
5.0

Wouldn't consider using any other oil in our 3 vehicles

By 

from Mississippi

Verified Buyer

Comments about Signature Series 5W-20 Synthetic Motor Oil:

We use your product in our (2) cars and our 2500 truck. After burning the oil in our transmit ion in a previous
motor home, we switched to AMS andhad NO further oil problems .

  • How would you describe yourself?:
  • I love my vehicles / toys
  • What kind of vehicle/equipment do you have?:
  • We have 2 sedans& a 2500 Dodge
 
5.0

Signature oil

By 

from Kerrville,tx

Verified Buyer

Comments about Signature Series 5W-20 Synthetic Motor Oil:

25000 miles with a warranty! Incredible but thanks Amsoil

  • How would you describe yourself?:
  • I'm a DIY handyman
  • What kind of vehicle/equipment do you have?:
  • Cars,utv,2 cycle, boat
 
5.0

Really good

By 

from Québec, Canada

Verified Buyer

Comments about Signature Series 5W-20 Synthetic Motor Oil:

Just one oil change in a year.

  • How would you describe yourself?:
  • I love my vehicles / toys
  • What kind of vehicle/equipment do you have?:
  • dodge Journey "crossroad"
 
5.0

MY MECHANIC USES THE SAME OIL IN HIS VEHICLES.

By 

from CHICAGO

Verified Buyer

Comments about Signature Series 5W-30 Synthetic Motor Oil:

WE ONLY PUT ABOUT 6K MILES A YEAR ON OUR VEHICLES SO AN ANNUAL OIL CHANGE WORKS FINE AND SAVES LABOR. I HAVE A BYPASS FILTER SETUP (BP90) ON MY TRUCK SO NO WORRIES THERE, UP TO 248K IF MEMORY SERVES.

  • How would you describe yourself?:
  • I'm a DIY handyman
  • What kind of vehicle/equipment do you have?:
  • CARS, LAWN
 
5.0

Truly the best motor oil on the planet

By 

from Dallas, GA

Verified Buyer

Comments about Signature Series 5W-20 Synthetic Motor Oil:

The oil doesn't break down, does not lose his lubricity over a long period of time awesome motor oil

  • How would you describe yourself?:
  • I'm a professional mechanic
  • What kind of vehicle/equipment do you have?:
  • Automobiles boats ATVs motorcycles etc..
 
5.0

5W-20 Oil and Filter

By 

from New Mexico

Verified Buyer

Comments about Signature Series 5W-20 Synthetic Motor Oil:

My mechanic says that the Amsoil 5W-20 oil and filter is the best thing, other than keeping the car clean, that I can do for my Charger. I agree with my mechanic.

  • How would you describe yourself?:
  • I love my vehicles / toys
  • What kind of vehicle/equipment do you have?:
  • 2006 Dodge R/T Charger upgraded to 470HP
 
5.0

Highly recommend

By 

from Waterford ontario

Verified Buyer

Comments about Signature Series 5W-30 Synthetic Motor Oil:

Save me money and gives me peace of mind

  • How would you describe yourself?:
  • I love my vehicles / toys
  • What kind of vehicle/equipment do you have?:
  • JEEP
 
5.0

Run in everything

By 

from Colville wa.

Verified Buyer

Comments about Signature Series 5W-30 Synthetic Motor Oil:

We have cars, trucks, tractors, snowmobiles, atv's, and a Harley,, all have AMSOIL in them and we've never had engine failure. Expensive up front but oil changes are farther apart and you have premium quality product running through the machine and when you look at the long range you have top of the line for the same price as the budget brand yet so much more protection

  • How would you describe yourself?:
  • I love my vehicles / toys
 
5.0

Very great oil, last very long.

By 

from Toronto, Ontario

Verified Buyer

Comments about Signature Series 0W-20 Synthetic Motor Oil:

This is a great motor oil and I plan to get a new version that I saw of it on amsoil.

  • How would you describe yourself?:
  • I love my vehicles / toys
  • What kind of vehicle/equipment do you have?:
  • Car

Displaying reviews 1-10

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