AMSOIL SIGNATURE SERIES 5W-20 100% SYNTHETIC MOTOR OIL

AMSOIL Signature Series 5W-20 100% Synthetic Motor Oil delivers the kind of protection most 5W-20 oils can't touch, with 75% more wear protection than the industry standard demands and a guaranteed drain interval of up to 25,000 miles. It's built for Ford F-150 EcoBoost owners, GM truck and SUV drivers, Honda CR-V and Accord owners, Toyota Camry and RAV4 drivers, and anyone running a modern gasoline direct injection engine that calls for a 5W-20.

Today's engines run hotter, rev harder, and pack more power into smaller displacement packages than ever before. Turbochargers, direct injection, and tighter tolerances push oil to its limits. Stop-and-go commuting, towing, and extended intervals between changes compound the problem. A conventional or basic synthetic 5W-20 can lose its ability to protect well before the oil change light comes on.

75% MORE PROTECTION AGAINST ENGINE WEAR
The Sequence IVA Engine Test simulates 100 hours of punishing stop-and-go driving, cycling between extended idling and elevated RPM to aggressively wear camshaft lobes. The industry standard (API SN PLUS) allows up to 90 microns of average cam wear. AMSOIL Signature Series 0W-20, the lightest viscosity in the lineup, recorded just 20.28 microns in the ASTM D6891 test, which is 75% less wear than the allowable limit. Signature Series develops a strong fluid film to keep metal surfaces separated, and its robust anti-wear additives reduce wear even further in metal-to-metal contact regions. For engines like the Ford 2.0L EcoBoost, GM Ecotec, or Honda Earth Dreams that rely on thin 5W-20 oil, that level of cam and piston protection directly translates to longer engine life and sustained horsepower.

PREVENTS TURBO COKING IN DIRECT INJECTION ENGINES
Turbocharged engines like the Ford 3.5L EcoBoost and GM 2.7L Turbo generate extreme heat in the turbocharger bearing area after shutdown. When oil breaks down under that heat, it forms hard carbon deposits on bearing and shaft surfaces, a process called turbo coking. Over time, the turbo loses efficiency or fails entirely. The GM Turbo Coking Test subjects oil to 2,000 extreme heat-soak cycles and requires the oil to limit the temperature change within the turbocharger to 13% or less. Signature Series limited the temperature increase to just 3.6%, protecting the turbocharger 72% better than the GM dexos1 Gen 2 specification requires. That margin of protection matters in real-world conditions where repeated short trips and hot shutdowns accelerate deposit formation.

28% MORE ACID-NEUTRALIZING POWER THAN MOBIL 1
Combustion byproducts generate acids that attack engine surfaces and degrade oil over time. Total Base Number (TBN) measures an oil's capacity to neutralize those acids. Signature Series 5W-20 carries a TBN of 12.5 (ASTM D2896), delivering 28% more acid-neutralizing power than Mobil 1 Annual Protection Full Synthetic 5W-30 in independent testing. That reserve of detergent and dispersant chemistry is what keeps engines cleaner over extended drain intervals. Signature Series also carries 50% more detergents than AMSOIL OE Motor Oil, helping keep oil passages clear and promoting consistent oil circulation throughout the engine.

90% BETTER SLUDGE PROTECTION
Engine failures caused by sludge often start at the oil pick-up tube screen. Once that screen plugs, the engine starves for oil. The Sequence VG Engine Test subjects a Ford 4.6L engine to 216 hours of sludge-inducing conditions. The industry standard allows up to 10% screen blockage before the oil fails. Signature Series produced a pick-up tube screen virtually free of sludge, delivering 90% better protection against sludge than the API SN PLUS standard requires, based on the ASTM D6593 engine test. For older GM 5.3L and Ford Modular engines that are especially susceptible to sludge buildup, that kind of cleaning power is directly relevant.

RESISTS VISCOSITY BREAKDOWN UNDER EXTREME HEAT
The Sequence IIIH Engine Test (ASTM D8111) runs at oil temperatures of 304°F to accelerate oil thickening and piston deposits. After a standard-length 90-hour test, Signature Series showed only a 0.1% viscosity increase, against an allowable limit of 100%. AMSOIL then doubled the test length using the same oil. Even after 180 hours, viscosity increased only 49.6%, still well under the single-length limit, and the oil delivered 40% cleaner pistons than the standard requires. That thermal stability is what allows Signature Series to protect consistently across a full 25,000-mile drain interval.

100% LSPI PROTECTION
Low speed pre-ignition is a real threat in modern GDI and turbocharged engines like the Ford EcoBoost, GM Ecotec Turbo, and Honda 1.5T. LSPI can break piston ring lands and cause catastrophic engine damage. Signature Series achieved zero LSPI events across five consecutive tests required by the GM dexos1 Gen 2 specification.

SPECIFICATIONS AND COMPATIBILITY
AMSOIL Signature Series 5W-20 (ALM) meets or exceeds the following specifications: API SP (Resource Conserving), SN PLUS, SN; GM dexos1 Gen 3 (supersedes dexos1 Gen 2 and 6094M); ACEA A1/B1; Ford WSS-M2C945-B1, WSS-M2C945-A, WSS-M2C930-A, WSS-M2C960-A1; Chrysler MS-6395; ILSAC GF-6A, GF-5, GF-4. It is compatible with other conventional and synthetic motor oils, though mixing will shorten the oil's life expectancy and reduce performance benefits. Aftermarket oil additives are not recommended.

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 conditions.

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, frequent towing, hauling, plowing, or driving in dusty conditions. Modified engines (non-stock), racing vehicles, and vehicles using alternative fuels (E85, CNG, propane) are excluded from extended drain interval recommendations. Do not exceed 12,000 miles or one year with non-AMSOIL oil filters unless longer intervals are recommended by the vehicle manufacturer.