AMSOIL Signature Series 5W-30 Synthetic Motor Oil
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Signature Series 5W-30 Synthetic Motor OilHelp

A New Level of Motor Oil Technology

Signature Series 5W-30 Synthetic Motor Oil Product Image
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$12.05 Retail Price (USD)
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Product Code: ASLQT-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.

ASL Package Sizes
Code Package Size Unit of Measure Product
ASLQT (ASLQT-EA) Quart Each Signature Series 5W-30 Synthetic Motor Oil
ASLQT (ASLQT-CA) Quart Case of 12 Signature Series 5W-30 Synthetic Motor Oil
ASL1G (ASL1G-EA) Gallon Each Signature Series 5W-30 Synthetic Motor Oil
ASL1G (ASL1G-CA) Gallon Case of 4 Signature Series 5W-30 Synthetic Motor Oil
ASL30 (ASL30-EA) 30-Gallon Drum Each Signature Series 5W-30 Synthetic Motor Oil
ASL55 (ASL55-EA) 55-Gallon Drum Each Signature Series 5W-30 Synthetic Motor Oil
ASL27 (ASL27-EA) 275-Gallon Tote Each Signature Series 5W-30 Synthetic Motor Oil
More about AMSOIL Reviews

REVIEW SNAPSHOT®

by PowerReviews
AMSOILSignature Series 5W-20 Synthetic Motor Oil
 
4.9

(based on 896 reviews)

Ratings Distribution

  • 5 Stars

     

    (866)

  • 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

 

First time running Amsoil

I changed to amsoil from gm dexos as I wanted something better for my Cruze. After 10k of running dexos as it was included with the car, I switched to amsoil and immediately noticed...Read complete review

I changed to amsoil from gm dexos as I wanted something better for my Cruze. After 10k of running dexos as it was included with the car, I switched to amsoil and immediately noticed the engine running quieter than with dexos. I am happy with the change so far and am looking forward to see how it holds up as I only have 1500 miles on it so far. We'll see what happens when I get into my second oil change.

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 896 customers

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5.0

Awsome Oil !!

By 

from Phoenix, AZ

Verified Buyer

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

Been using this product for more than 3yrs with 25,000 miles oil changes. My Van runs the same as the day I bought it @ 29,000 miles now nearing 248,000 miles.

  • How would you describe yourself?:
  • I use AMSOIL products for my business
  • What kind of vehicle/equipment do you have?:
  • 2012 Ford Transit Connect
 
5.0

My investment deserves the best oil available

By 

from PA

Verified Buyer

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

I drive my vehicle hard and fast and as in all my previous vehicles, I only use the highest quality and performing synthetic signature series oil as I feel it works well to protect my engine and I have never had a failure or worn out or blown up motor as my vehicles skirt around redline more often than not. Great protection and affordability and I can leave it in a little longer too knowing that the protection is there ( however I still change oil at 4500-5000 miles even though manufacturer says 8000)

  • How would you describe yourself?:
  • I'm a professional mechanic
  • What kind of vehicle/equipment do you have?:
  • 2015 Chrysler 200c awd
 
5.0

The best oil on the market. Period.

By 

from Phoenix AZ

Verified Buyer

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

I've been using Amsoil in my Supercharged Miata, running track days and daily driving. Using this oil is part of my strategy for dealing with heat and avoiding over-heating in the Phoenix heat. Zero engine problems, and I run this car hard.

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

Great Product

By 

from Dushore PA

Verified Buyer

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

Bought used 98 Cavalier, changed oil & filter to Amsoil after 3 tanks & ample road tests. Smoother running, increased power and economy. Car pulls hills better, idles better, and shifts smoother.

  • How would you describe yourself?:
  • I'm a full-on gearhead
  • What kind of vehicle/equipment do you have?:
  • Car/truck/heavy equiptment
 
5.0

Been using for years

By 

from Water Valley, MS

Verified Buyer

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

Use in everything I OWN

  • How would you describe yourself?:
  • I love my vehicles / toys
  • What kind of vehicle/equipment do you have?:
  • Camaro, Duramax, RZR, Zero Turn, etc
 
5.0

Good oil

By 

from North eastern Wisconsin

Verified Buyer

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

I been running Amsoil for years

  • How would you describe yourself?:
  • I love my vehicles / toys
  • What kind of vehicle/equipment do you have?:
  • tractor,3 cars,
 
5.0

I would buy this product every time have tested it

By 

from Kennesaw ga

Verified Buyer

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

Have tested it out an out performs wvery thing else as in apples to apples

  • How would you describe yourself?:
  • I use AMSOIL products for my business
  • What kind of vehicle/equipment do you have?:
  • Vans an autos
 
5.0

Best on the market

By 

from Wisconsin

Verified Buyer

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

AMSOIL, the best thing that ever happened to my automobiles! I have used AMSOIL for decades and would not change to a different brand even if it came free...

  • How would you describe yourself?:
  • I love my vehicles / toys
  • What kind of vehicle/equipment do you have?:
  • trucks, cars, motorcycle, jd tractors ..
 
5.0

I'll continue to buy this product

By 

from Wittmann, AZ

Verified Buyer

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

I've been using Signature Series 5W-30 Synthetic Motor Oil since I purchased my 07 Silverado back in 06. I change my oil once a year and have had no problems at all. My truck now has 196K+ miles and only recently I've had to add about a half quart after 6 months. I think I'll start changing the oil twice a year from now on. My truck deserves it. Amsoil synthetic oils are the best!

  • How would you describe yourself?:
  • I'm a DIY handyman
  • What kind of vehicle/equipment do you have?:
  • 2007 Chevy Silverado 1500 Classic Pickup
 
5.0

best oil out there

By 

from houston tx

Verified Buyer

Comments about Signature Series 5W-50 Synthetic Motor Oil:

i run this in my track pack 2014 mustang GT with a Paxton supercharger , the car makes 740whp and the oil lasts well over 12,000 miles and i dint tack it easy on this car , i drive it very hard and the oil really protects my 5.0 even at this power level . only oil i will use from now on !!

  • How would you describe yourself?:
  • I'm a full-on gearhead
  • What kind of vehicle/equipment do you have?:
  • 740hp supercharged 5.0 mustang coyote

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