AMSOIL Signature Series 5W-20 100% Synthetic Motor Oil
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Premium Protection for 5W-20 Applications
AMSOIL Signature Series 5W-20 is engineered for vehicles requiring 5W-20 viscosity motor oil. It delivers 75% more engine protection against horsepower loss and wear, with guaranteed protection for up to 25,000 miles or 1 year.
Key Benefits
- 75% more engine protection against horsepower loss and wear
- Guaranteed protection for up to 25,000 miles or 1 year
- 50% more cleaning power vs. GM dexos1 Gen 3 test
- Advanced protection against LSPI
- Superior turbocharger protection
- Excellent cold-weather performance
Technical Specifications
| Property | Value |
|---|---|
| Kinematic Viscosity @ 100°C, cSt | 8.8 |
| Kinematic Viscosity @ 40°C, cSt | 50.6 |
| Viscosity Index | 153 |
| Cold-Crank Viscosity | 4,385 cP (-30°C) |
| HTHS Viscosity, cP | 2.67 |
| Flash Point | 220°C (428°F) |
| Fire Point | 244°C (471°F) |
| Pour Point | -50°C (-58°F) |
| NOACK Volatility, % weight loss | 5.8% |
| Total Base Number (TBN) | 12.5 |
Industry Certifications & OEM Approvals
API
- SP (Resource Conserving)
ILSAC
- GF-6A
GM
- dexos1 Gen 3
Ford
- WSS-M2C960-A1
Chrysler
- MS-6395
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 5W-20 100% Synthetic Motor Oil Today
Order directly through National Synthetics for Preferred Customer pricing and fast shipping.
SHOW MY PRICEIndependent AMSOIL Dealer #1858536
Shipping & Returns
Fast, Reliable Shipping
- Free standard ground shipping on orders of $100 ($130 in Canada) or more.
- Orders under the threshold ship for a flat $9.99 ($12.99 in Canada) freight charge.
- In-stock items typically delivered in two to three business days.
- U.S. and Canada only — no shipments to PO Boxes.
30-Day Return Policy
- Return unopened, currently marketed products within 30 days for a full refund (minus freight).
- Exchange unopened products within 90 days with no restocking fee.
- Special-order items are non-returnable.
- Returns are handled directly by AMSOIL.
Frequently Asked Questions
5W-20 is commonly recommended for many Ford, Honda, and Chrysler vehicles. Always check your owner's manual to confirm the correct viscosity for your specific vehicle.
AMSOIL Signature Series 5W-20 is guaranteed for up to 25,000 miles or 1 year under normal service conditions. Under severe service, change at 15,000 miles or 1 year.
Customer Reviews
See all 6,629 reviewsThe 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. Bottom Line Yes, I would recommend this to a friend.
Independent AMSOIL Dealer #1858536. Product information sourced from AMSOIL. Visit AMSOIL.com for the most current product details and availability.