AMSOIL Signature Series 0W-40 100% Synthetic Motor Oil
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Performance Protection for European & High-Output Engines
AMSOIL Signature Series 0W-40 is purpose-built for European and performance vehicles demanding 0W-40 viscosity. With a viscosity index of 184 — the highest in the lineup — it maintains consistent protection across extreme temperature ranges, from -50°C cold starts to sustained high-RPM operation.
Key Benefits
- 75% more engine protection against horsepower loss and wear
- Highest viscosity index (184) for extreme temperature range
- Guaranteed protection for up to 25,000 miles or 1 year
- Meets Chrysler MS-A0921 for SRT and performance applications
- GM dexos R approved for Corvette and performance vehicles
- Excellent cold-weather starting at -50°C (-58°F)
Signature Series Guards Turbos
Protects turbochargers 72% better than required by the GM dexos1* Gen 2 specification based on indepenent testing of AMSOIL Signature Series 5w-30 in the GM turbo coking test.
Technical Specifications
| Property | Value |
|---|---|
| Kinematic Viscosity @ 100°C, cSt | 14.8 |
| Kinematic Viscosity @ 40°C, cSt | 84.6 |
| Viscosity Index | 184 |
| Cold-Crank Viscosity | 6,062 cP (-35°C) |
| HTHS Viscosity, cP | 3.76 |
| Flash Point | 222°C (431°F) |
| Fire Point | 238°C (460°F) |
| Pour Point | -50°C (-58°F) |
| NOACK Volatility, % weight loss | 7.7% |
| Total Base Number (TBN) | 12.5 |
Industry Certifications & OEM Approvals
API
- SP, SN PLUS, SN
Chrysler
- MS-A0921, MS-12633, MS-10725, MS-10850
GM
- dexos R
Nissan
- GT-R approved
Service Life
Normal Service
Up to 25,000 miles (40,200 km), 700 hours of operation or one year, whichever comes first, in personal vehicles not operating under severe service.
Severe Service
<p>Up to 15,000 miles (24,140 km), 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.</p> <p>Change at the vehicle manufacturer's recommended drain interval outside U.S. and Canada.</p>
Extended drain intervals do not apply to:
- Modified engines (non-stock), racing vehicles and vehicles using alternative fuels (E85, CNG, propane, etc.) are excluded from extended drain interval recommendations.
What are some applications that may be best serviced with AMSOIL AZF?
Pros and Cons
Pros
- Industry-Leading Protection: 75% more engine protection against horsepower loss and wear than required by a leading industry standard.
- Extended Drain Intervals: Guaranteed protection for up to 25,000 miles or one year, reducing oil change frequency. Extended drain intervals are safest when supported by an implemented testing program.
- Superior Cold-Start Performance: Flows easily at sub-zero temperatures to reduce engine stress during winter starts.
Cons
- Premium Investment: Higher initial cost compared to conventional or "shelf-brand" synthetic oils.
- Limited Local Retail: Primarily available through authorized dealers and specialized synthetic outlets. National Synthetics is a local stocking dealer. Call 1-678-944-8816 to confirm in-stock items for same-day local pickup.
Get AMSOIL Signature Series 0W-40 100% Synthetic Motor Oil Today
Order directly through National Synthetics for Preferred Customer pricing and fast shipping.
SHOW MY PRICEIndependent AMSOIL Dealer #1858536
Frequently Asked Questions
0W-40 is commonly used in European vehicles (Mercedes-Benz, BMW, Porsche, Audi), Chrysler SRT models, Nissan GT-R, and GM Corvette. Check your owner's manual to confirm the correct viscosity.
Yes. With a pour point of -50°C (-58°F), Signature Series 0W-40 flows readily in extreme cold while the 40-weight rating provides robust protection at operating temperature.
Yes - perfect choice. AMSOIL Signature Series 0w-40 is a great choice to protect your L87 when GM recommends you switch from 0w-20 to 0w-40.
Customer Reviews
See all 6,629 reviewsGreat oil
I’ve been using Amsoil for several years now. It’s not cheap, but well worth the price.
Great Product
Amsoil has protected me for years now all my engines never had an issue. All the research I’ve done leads to amsoil being the superior product among the oil masses
The only oil you need
I’ve been running AMSOIL in my 2020 Jeep Gladiator Mojave and I’m seriously impressed. The engine runs noticeably smoother and quieter, even after long drives and hard use. I do a mix of highway, city, and off-road driving, and AMSOIL has held up perfectly in all conditions. Throttle response feels sharper, and I’ve had zero issues with performance or oil consumption. It gives me real peace of mind knowing my Gladiator is protected, especially in extreme heat and rugged terrain. Definitely worth the investment—I’ll be sticking with AMSOIL from here on out.
Amsoil signature series 100%synthetic motor oil
I have been using Amsoil signature series synthetic oil since 2005. Best synthetic oil I have ever put in any of my engines.
AMSOIL PRODUCT WARRANTY
Using AMSOIL synthetic lubricants does not void your new vehicle or equipment manufacturer’s warranty. All AMSOIL lubricants and information visit AMSOIL.com/warranty.aspx.
1 Note: Engineered to meet the updated GM service requirements for the L87 6.2L engine. As GM transitions away from 0W-20 to a higher-viscosity 0W-40 specification to enhance engine longevity and component protection, our formula provides the exact shear stability and film strength required for this updated service interval.
Independent AMSOIL Dealer #1858536. Product information sourced from AMSOIL. Visit AMSOIL.com for the most current product details and availability.