AMSOIL Signature Series 5W-30 Synthetic Motor Oil
NEW AMSOIL OE Series
Learn More

Signature Series 5W-30 Synthetic Motor OilHelp

A New Level of Motor Oil Technology

Signature Series 5W-30 Synthetic Motor Oil Product Image
Click image to enlarge
$12.05 Retail Price (USD)
QTY:
Product Code: ASLQT-EA
Product Highlights View Full Description

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
 
5.0

(based on 934 reviews)

Ratings Distribution

  • 5 Stars

     

    (904)

  • 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 934 customers

Displaying reviews 1-10

Back to top

Previous | Next »

 
5.0

Would only use thlis product

By 

from Raleigh,NC

Verified Buyer

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

I do not use any other product for autos

  • How would you describe yourself?:
  • I love my vehicles / toys
  • What kind of vehicle/equipment do you have?:
  • 2010- Ford F-150-----2015 Dodge Durango
 
5.0

I have faith in Amsoil products

By 

from Allendale, MO

Verified Buyer

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

I have never used the 5W-30 product before, but the vehicle I'm replacing (a 2004 Hyundai with 220,000 miles) never had anything except Signature Series 10W-30. When 'Sam' got totaled, I had NEVER had to add a quart of oil between changes.
Everything I own that has a motor has Amsoil in it.

  • How would you describe yourself?:
  • I'm a DIY handyman
  • What kind of vehicle/equipment do you have?:
  • This field is hosed. NOT BIG ENOUGH!!!!!
 
5.0

Good oil

By 

from Usa

Verified Buyer

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

It's good oil. Expensive but good. Looks clean after I change it. Can't complain

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

Good oil for VVT engines

By 

from Watertown,SD

Verified Buyer

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

I have had 2 vehicles that required 0w20 oil. Both vehicles had variable valve timing engines and the oil worked very well for them. It allowed easy cold starts and provided good fuel economy.

  • How would you describe yourself?:
  • I'm a DIY handyman
  • What kind of vehicle/equipment do you have?:
  • 2014 GMC 1500, 2017 Jeep Grand Cherokee
 
5.0

Perfect product for my HD pickup

By 

from Watertown,SD

Verified Buyer

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

Amsoil saves me money by providing a product that is guaranteed for 1 year so I only need to do one oil change instead of multiple every year. I use it in everything from my 3500HD pickup to my snowblower and they have provided me with flawless results and I know my engine is being protected for the entire year

  • How would you describe yourself?:
  • I'm a DIY handyman
  • What kind of vehicle/equipment do you have?:
  • GMC 3500HD
 
5.0

Best Available

By 

from Bethel, PA

Verified Buyer

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

Continuing to use this oil in our 2004 Prius with over 220,000 mi. with no leakage or burning oil between annual oil changes. I've used Amsoil for over 20 years in all kinds of applications always with excellent results.

  • How would you describe yourself?:
  • I love my vehicles / toys
  • What kind of vehicle/equipment do you have?:
  • 3 antiques & 3 Toyotas for daily use.
 
5.0

Yes I would buy this again.

By 

from Excelsior Spring Mo

Verified Buyer

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

I have used this oil before, and I'm glad I'm using it again. This oil helps my engine run better, I'm pleased with this oil.

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

I use this in all my vehicles, and my kids do also

By 

from Sioux City, IA

Verified Buyer

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

I have used this for several years in all my vehicles. I think it provides the best protection against wear in the engine. Plus in the long run I think it is economical to use, change once a year or 25,000 miles.

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

Great product

By 

from Florida

Verified Buyer

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

I am very busy with family , work and play.. so to use this product makes my life a little bit simpler ., I put it in all my vehicles ..so I only have to worry about the oil once a year .. and the protection it gives is also peace of mind .. excellent product. Thank you amsoil .

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

AMSOIL OIL QUALITY

By 

from SULPHUR SPRINGS, TEXAS

Verified Buyer

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

BEST OIL SOLD IN THE USA, NO MATTER WHAT TYPE OF CAR YOU DRIVE

  • How would you describe yourself?:
  • I love my vehicles / toys
  • What kind of vehicle/equipment do you have?:
  • FORD F-150, CHEVROLET TAHOE, NISSAN ALTI

Displaying reviews 1-10

Back to top

Previous | Next »