AMSOIL Signature Series Motor Oil for Gas Engines
AMSOIL Signature Series 100% Synthetic Motor Oil is built for gasoline engines that need more than basic oil protection. It is a strong choice for drivers who want high wear protection, excellent engine cleanliness, protection for turbocharged and direct-injected engines and the confidence of a long-drain interval.
This page is focused only on Signature Series motor oils for gas-engine applications.
Use the AMSOIL Auto & Light Truck Lookup Guide
Shop Signature Series Gasoline Motor Oil
Why choose Signature Series?
Signature Series is designed for gasoline-engine owners who want AMSOIL’s highest level of protection in this category. Official AMSOIL Signature Series claims highlight why many drivers choose it:
- 75% more engine protection against horsepower loss and wear
- 72% better turbocharger protection than required by the GM dexos1 Gen 2 specification
- 100% protection against low-speed pre-ignition (LSPI)
- 90% better protection against sludge
- Guaranteed protection for up to 25,000 miles or 1 year
That combination makes it a strong fit for daily drivers, high-mileage commuters, turbocharged engines, direct-injected engines and performance-minded gasoline vehicle owners who want a wider margin of protection.
How can Signature Series go so many miles?
AMSOIL supports the long-drain positioning of Signature Series with more than one benefit. Signature Series is designed to resist viscosity increase, help keep pistons cleaner, use a detergent system that helps keep oil passages clean and promote oil circulation, and fight sludge over time.
In official AMSOIL performance testing, Signature Series showed extremely strong viscosity control and piston cleanliness. AMSOIL says it demonstrated only 0.1% viscosity increase in testing and delivered 40% cleaner pistons than required by the standard. Those kinds of results help explain why Signature Series is positioned as a long-drain gasoline motor oil instead of just another full synthetic.
AMSOIL lists Signature Series with guaranteed protection for up to 25,000 miles or 1 year. The right oil still starts with the right fitment, viscosity and application requirements, so use the lookup guide before you buy.
Signature Series gasoline viscosity lineup
Signature Series covers the core viscosity grades most gasoline vehicle owners look for, plus specialty options for select performance applications.
Modern low-viscosity options
These are the go-to choices for many newer gasoline vehicles that call for lighter oils to support fuel economy, fast cold-start flow and modern engine design.
- 0W-16
- 0W-20
- 5W-20
Core everyday viscosities
These are popular choices for a wide range of gasoline cars, SUVs and light trucks. They are often where drivers land when they want a balance of year-round drivability, strong protection and long-drain confidence.
- 0W-30
- 5W-30
- 10W-30
Specialty performance viscosities
These are for select higher-output or specialty gasoline applications that specifically call for them. They are not universal upgrades, so verify fitment before you buy.
- 0W-40
- 5W-50
Direct Signature Series product links
All direct oil links are grouped here for quick shopping.
- AMSOIL Signature Series 0W-16 100% Synthetic Motor Oil — ultra-low-viscosity option for gasoline applications that specifically require 0W-16
- AMSOIL Signature Series 0W-20 100% Synthetic Motor Oil — a common late-model gasoline-engine viscosity with strong cold-start flow
- AMSOIL Signature Series 5W-20 100% Synthetic Motor Oil — for gasoline engines that call specifically for 5W-20
- AMSOIL Signature Series 0W-30 100% Synthetic Motor Oil — a 30-weight option with excellent cold-weather flow for the right gas-engine fitments
- AMSOIL Signature Series 5W-30 100% Synthetic Motor Oil — one of the most popular all-around gasoline-engine choices
- AMSOIL Signature Series 10W-30 100% Synthetic Motor Oil — for gasoline applications that require 10W-30
- AMSOIL Signature Series 0W-40 100% Synthetic Motor Oil — specialty viscosity for select high-output and performance gasoline applications
- AMSOIL Signature Series 5W-50 100% Synthetic Motor Oil — specialty viscosity for select performance applications that specifically call for 5W-50
Start with fitment
The safest way to choose Signature Series is to confirm the exact oil, viscosity, oil capacity and filter for your vehicle before ordering.
Find Your Fit in the AMSOIL Auto & Light Truck Lookup Guide
Explore All AMSOIL Product Guides
Diesel information
For diesel information, visit /diesel. The diesel page covers all things diesel.
Other gas motor oils
For other gasoline motor oils besides Signature Series, visit /automotive-oils.
Warranty information
AMSOIL products are Warranty Secure, keeping your factory warranty intact. For full details, review the AMSOIL Guarantee.