Signature Series 0W-20 Synthetic Motor Oil 

One of the top sellers in the Sioux Falls store! I use this in my ford Inline 4 EcoBoost which calls for a 5W-20 which is great but a 0W-20 is even better. It replaces all 5W-20’s as well as over performs any 0W-20 on the market. A true 100% synthetic which is guaranteed to hold its grade. Unlike our competitors this oil will not clog up your intake system via vapors in the PCV.  On direct injection engines (DFI) you must use the cleanest synthetic possible. Ours is the only true 100% synthetic 0W-20 that I know of currently so it solves problems, saves fuel and extends engine life.

The Next Generation in Motor Oil Technology

AMSOIL Signature Series Synthetic Motor Oil is engineered to outperform conventional and synthetic motor oils. It combines industry-premier synthetic technology with AMSOIL premium additives in a unique formulation that exceeds the higher performance demands of modern engines. Signature Series delivers the performance and value upon which the AMSOIL reputation is built. The culmination of more than 40 years of expertise, its exclusive formulation raises the bar for motor oil performance.

Signature Series 0W-20 Synthetic Motor Oil AMSOIL, the leader in automotive synthetic lubrication, produced the world?s first API-qualified synthetic motor oil in 1972. Trust the extensive experience and devotion of AMSOIL, the First in Synthetics®, to do the best job protecting your engine.

Protects Your Engine

AMSOIL Signature Series 0W-20 Synthetic Motor Oil provides outstanding anti-wear protection. It 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. In the industry-standard Sequence IIIG Engine Test, AMSOIL Signature Series Synthetic Motor Oil delivered 75 percent more engine protection against horsepower loss and wear than required by a leading industry standard.** For details, see the Double-Length Sequence IIIG Engine Test Technical Study (G3320).

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Maximizes Fuel Economy

Signature Series Synthetic 0W-20 Motor Oil is designed to maximize energy efficiency for optimum fuel economy. Unlike conventional oils, its uniform molecular structure helps it flow more freely and reduce friction between metal surfaces. Anti-friction additives are included to further improve energy efficiency.

Extends Drain Intervals

Signature Series Synthetic 0W-20 Motor Oil can extend drain intervals far beyond those recommended for conventional oils. Its 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. It reduces vehicle maintenance and waste oil.

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Keeps Pistons Clean

Excess piston deposits can lead to pre-ignition and engine knocking, which results in lost power, reduced fuel economy and, in severe cases, engine damage. Signature Series’ premium additives and naturally high resistance to extreme heat help keep pistons clean for maximum engine performance. Signature Series prevents piston deposits 93 percent better than required to meet the latest API standard.**



Excels in Extreme Temperatures

Signature Series resists thermal (heat) breakdown better than conventional and synthetic motor oils. It is heavily fortified with detergent and dispersant additives to help prevent sludge deposits and keep engines clean. Unlike conventional oils, Signature Series contains no wax, staying fluid in sub-zero temperatures for easier starting, improved oil flow and reduced wear. the ZERO in 0W is for that purpose. It represents a value of cranking loss in the 20WT range. (It’s not a “0” weight oil).

Reduces Oil Consumption and Emissions

Volatility (burn-off) occurs when oil gets hot, causing high oil consumption and emissions. Signature Series resists volatility better than other oils, helping reduce oil consumption and emissions.


AMSOIL Signature Series Synthetic Motor Oil is excellent for use in all types of gasoline-fueled passenger cars and light trucks. It is recommended for all domestic and foreign vehicles requiring any of the following performance specifications:

0W-20 (ASM): API SN (Resource Conserving), SM…; ILSAC GF-5, GF-4…; ACEA A1/B1; GM dexos1™ (supersedes 6094M) Fortified with detergents that exceed dexos1 sulfated ash specifications; Chrysler MS-6395; Ford WSS-M2C947-A

*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 AMSOIL-engineered for use in the applications shown.


AMSOIL Signature Series Synthetic Motor Oil is compatible with other conventional and synthetic motor oils. Mixing AMSOIL motor oils with other oils, however, will shorten the oil’s life expectancy and reduce its performance benefits. AMSOIL does not support extended drain intervals where oils have been mixed.

Aftermarket oil additives are not recommended for use with AMSOIL synthetic motor oils.


  • Normal Service – Up to 25,000 miles, 700 hours of operation or one year, whichever comes first, in personal vehicles not operating under Severe Service.
  • Severe Service – Up to 15,000 miles, 700 hours of operation or one year, whichever comes first.

Severe Service: Primarily short trips (less than 10 miles [16 km]); turbo/supercharged engines; commercial or fleet vehicles; excessive idling; first-time use of AMSOIL motor oil in a vehicle with more than 100,000 miles; frequent towing, hauling, plowing or driving in dusty conditions.

  • Modified engines (non-stock) and those using E85 fuel are excluded from extended drain recommendations.
  • Change at the vehicle manufacturer’s recommended drain interval outside U.S. and Canada.
  • AMSOIL Ea® Full-Flow Oil Filters are designed for extended change intervals. With other brands, do not exceed six months or 10,000 miles unless longer intervals are recommended by the vehicle manufacturer.
  • Check oil regularly to maintain proper fill levels.

AMSOIL Ea® Full-Flow Oil Filters are designed for extended change intervals. They stop smaller particles, flow more oil and last longer than regular filters. For best performance, use AMSOIL Ea Full-Flow Oil Filters.

Sioux Falls cars are more efficient than ever thus you see 0W-20 being recommended in more and more models. It’s a win when you use the one true synthetic. You can actually feel the difference. Trust only AMSOIL Signature Series for the best performance available. AMSOIL is devoted to this market!


AMSOIL products are backed by a Limited Liability Warranty. For complete information visit AMSOIL Warranty Information.

Buy in the Sioux Falls AMSOIL store at 4610 W. 12th St. or use this Online link to the Amsoil sale page if you are outside of the area.

Customer Reviews:

Tony – Gatortail

My order arrived on time and un-damaged. I use Amsoil in my Gatortail engine (Briggs) replacing the oil at 25-35 hours with a total of 550 hours on the engine. The oil holds up very well. When conducting maintenance on the engine the interior working parts of the engine are like new with absolutely no visible signs of sludge build up. I highly recommend the use of Amsoil products. I also use the Amsoil Marine Grease in the lower unit and that product holds up very well as well.

David – Amazing synthetic oil.

I swear by this oil. Simply the best fully synthetic oil out there. I got 220000 miles on my Altima and still has great fuel mileage and power.

Jeremiah – Best in the World by Far!

The most superior motor oil in world! It actually last 25,000 miles in my 2009 Toyota Venza and 2007 Chevy Malibu! When I drain it at 25,000 miles it doesn’t look like its even lost its viscosity or characteristics! Best oil on the planet!