Signature Series SAE 0W-30 Synthetic Motor Oil (AZO)

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.

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Printable Product Data Sheet for AMSOIL 0W30 Signature Series Motor Oil.

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Back in the 35th year – Mr. Amatuzio (AZO for Amatuzio Oil) has once again demanded his staff to improve the top engine oil performer to the ultimate in wear protection and engine cleanliness without effecting price. The 0W-30 was the first addition to the “Signature Series” which is upgraded once again. With the 0W30 you get the best in winter protection too with increased flow to the filter at start-up not to mention the standing film strength no other oil can match.

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

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.

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.

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.

Easier Cold-Starts

Signature Series Synthetic 0W-30 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.

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.

1 Based on proposed ILSAC GF 5 Plus specification


AMSOIL’s 0W-30 is a secrete winning formula for avid SCCA Autocross and grassroots racing. When you see that AMSOIL logo on select cars you know they chose our brand due to performance and their own trials. We earn their commitment t the AMSOIL authentic synthetic base oils and additive packages which deliver like no other!


As A.J. Amatuzio neared the end of his 25-year career as an award-winning jet fighter pilot, he set his sights on a new challenge. Knowing that every jet engine in the world used only synthetic oil, he was convinced that the same type of technology would provide tremendous benefits to automotive engines. In the early-1960’s he set out on an intense period of research and development.

In 1972 A.J. Amatuzio created AMSOIL INC. and introduced the world’s first API qualified synthetic motor oil, AMSOIL 10W-40. But obstacles remained for Amatuzio. The major oil companies were threatened by his advanced technology and, along with the auto manufacturers, refused to acknowledge his revolutionary new product.

Amatuzio persevered. Through sheer determination he began to convince the motoring public that AMSOIL synthetic motor oil was far superior to the conventional petroleum oils they had been using. Then, as consumers caught on by the thousands, the competing oil companies could no longer deny the performance benefits of AMSOIL motor oil. They were forced to follow the AMSOIL lead and, one by one, developed synthetic oils of their own. Amatuzio had humbled an industry.

Today, AMSOIL remains the leader in quality and innovation. A.J. Amatuzio Signature Series Motor Oil is engineered with the world’s most advanced synthetic base oils and high-performance additives. This exclusive formulation represents the benchmark in motor oil technology and sets the standard by which all other motor oils are measured.

Amsoil AZO Signature Series 0W30 can be described as the ultimate product by the descriptions above but in our own use over the years this is the oil which the level of performance goes beyond what the intended purpose can describe. If I could sell this product on one point or one word I would say ‘free’ meaning on a stick shift car where you can feel the acceleration best, you will instantly take notice the improvement of the free revving nature and smoothness of the engine.
We get plenty of feedback from our new customers with the same opinion.

I would have to say AMSOIL ‘s 0W30 has done more for word of mouth sales than any other passenger car oil that we sell. If you are an enthusiast behind the wheel of any modern car why not see for yourself? Ask for AMSOIL AZOQT-CA – that’s the 12 quart case – best price…