AMSOIL Signature Series Motor Oil FAQs

Signature Series FAQs

What is AMSOIL Signature Series 100% Synthetic Motor Oil?

It is AMSOIL’s top‑tier motor oil, formulated with premium synthetic base oils and advanced additive systems for maximum engine protection.

What performance claims are associated with Signature Series?

Per AMSOIL published data, Signature Series provides up to 75% more engine protection against horsepower loss and wear versus the industry standard, offers 50% more cleaning power vs. AMSOIL OE, and achieved 100% protection against LSPI in the GM dexos1 Gen2 engine test.

What is the normal‑service drain interval?

Up to 25,000 miles or one year, whichever comes first, for gasoline engines under normal service (per product guidance). Always confirm the specific product’s recommendations for your application.

What is the severe‑service interval?

Up to 15,000 miles or one year for gasoline engines in severe service. Adjust intervals based on operating conditions and monitoring.

Which viscosity grades are available?

Common grades include 0W‑20, 5W‑20, 5W‑30, 0W‑40 and others. Select the viscosity recommended by your vehicle manufacturer.

What kind of wear and sludge protection does it provide?

AMSOIL reports strong wear protection and significantly improved sludge control vs. standard benchmarks, including up to 90% better sludge protection in specified testing.

Does using AMSOIL affect my manufacturer warranty?

Using AMSOIL does not automatically void your warranty. Use the OEM‑specified viscosity and follow appropriate service intervals.

What is the shelf life of sealed AMSOIL oils?

Up to five years when stored properly in original sealed containers.

What about Signature Series Max‑Duty Synthetic Diesel Oil?

AMSOIL states it provides up to 6× more wear protection, excellent cold‑flow for sub‑zero conditions, and reduced oil consumption (up to 76%) compared to reference values in AMSOIL reporting.

How do I choose the correct viscosity?

Always use the manufacturer‑recommended viscosity. Confirm fitment with the AMSOIL Product Guide.