Signature Series 0W-20 100% Synthetic Motor Oil (2024)

If you need a 0W-20 you need one which stays it’s viscosity. You need a synthetic that has been tested to prevent wear in engines designed in the 1990’s for 5W-30! Our 0W-20 works that well.

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.

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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 provided75 percent more engine protection against horsepower loss and wear¹than required by the industry standard, extending the life of vital components like pistons and cams.¹Based on independent testing of AMSOIL Signature Series 0W-20, in ASTM D6891 as required by the API SN specification.

Dealers Note:

I run this in my Ford Ecoboost 1.6 Ford Transit Van. As I add miles, the mileage seems to get better all the time. As it’s a turbocharged GDI motor which is exactly what this oil was designed for. Designed to run hot! AMSOIL henceforth is the only choice! Only their unique base stock can prevent the effects of oil deposits from building up within the intake system over a long period of time. None the less LSPI as newer versions of GDI engines are produced with more advanced timing. I haul 1200 to 1400 pounds every other week 280 miles and I am now seeing 24 to 26 MPG on the interstate cruising at 65 to 70 (depending on weather conditions) and over 30 miles per gallon on empty loads. Testing shows all other premium products will leave 20% or more deposits in this engine. Thus AMSOIL Signature Series is the only choice! (5W-30 is required in the larger SIX Cyl. engines and 5W-20 or 0W-20 is the recommendation for select four cylinder ones.)

AMSOIL, the leader in automotive synthetic lubrication, produced the world’s first API-qualified synthetic motor oil in 1972. Trust the extensive experience of AMSOIL, the First in Synthetics®, to do the best job protecting your engine.

“If you need a 0W-20 (or 20 weight motor oil) this is the one you want to use. Keeps it’s viscosity under all loads and delivers year round maximum efficiency. This was designed to replace any 5W-20 viscosity for a better performing all around product.”

The Signature Series is the best oil available and features the true 100% synthetic formula.

Extends Drains: Protection Guaranteed

“Oh I don’t care how many miles it says you can go – I’ll still change at the factory recommendations” – Actually we agree. The extended drain information is a way to show just how tough these lubricants are. They are showing you the available protection compared to the rest. Problems, added loads, unexpected failures (lost coolant, etc) dirty valves, will have less implications when using the Signature Series.

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.

¹Based 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.
²Based on independent testing of AMSOIL Signature Series 5W-30 in the GM turbo co*king test.
³vs. AMSOIL OE Motor Oil
⁴Based 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 endorsem*nt 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 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 Seriesprovides 66 percent better cold-temperature performancefor 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.¹This 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.

¹Based 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 endorsem*nt claim, express or implied, is made by their use. All products advertised here are developed by AMSOIL for use in the applications shown.

Manufacturer APPLICATIONS for Amsoil 0W-20 Signature

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

0W-20 (ASM): API SP (Resource Conserving), SN PLUS, SN…; GM dexos1* Gen 3
(supersedes dexos1 Gen 2 and 6094M); ACEA A1/B1;
Ford WSS-M2C947-B1, WSSM2C947-A, WSS-M2C962-A1; Chrysler MS-6395; ILSAC GF-6A, GF-5, GF-4

COMPATIBILITY

AMSOIL 0W-20 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.

SERVICE LIFE

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 conditions
include commercial or fleet vehicles; excessive idling; or frequent
towing, hauling, plowing or driving in dusty conditions.

• Modified engines (non-stock), racing vehicles and vehicles
  using alternative fuels (E85, CNG, propane, etc.) are excluded
  from extended drain interval 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 drain
  intervals. Do not exceed 12,000 miles or one year with other
  brand filters unless longer intervals are recommended by the
  vehicle manufacturer. Always change filter when changing oil.
• Check oil regularly to maintain proper fill levels.

AMSOIL Ea Full-Flow Oil Filters stop smaller particles, flow moreoil and last longer than regular filters. For best performance, use AMSOIL Ea Full-Flow Oil Filters.

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See Data Bulletin for more details

0W-20 Product Reviews

Decade’s later still a fantastic product

ByJAMES, aVerified Buyer fromNew Brunswick Canada onDecember 10, 2023

I have used this product and many others from AMSOIL and it’s performance has been second to none. Yes i have seen increased fuel mileage, and I know this means less friction, easier cold starts and better hot weather performance. Yes you really can realize a difference of you switch from your current oil and Use Signature Series Synthetics

Simply The Best Motor Oil

ByTONY, aVerified Buyer onDecember 10, 2023

Received my shipment fast. My Ford F250 6.2L runs better and smoother than it did with other Synthetic oils. I highly recommend this oil for anyone who wants their automobile engine to last longer.

Newer Honda’s/Toyota/Lexus best oil

ByRUSSELL, aVerified Buyer fromGlasgow Kentucky onApril 20, 2023

When buying new SUV or cars costing $50 to $90K the best oil is valuable insurance for long life of engines. I said the life of the engine is the life of the vehicle