Technical Evidence

AMSOIL Performance Tests & Technical Data

A plain-English look at selected standardized test results AMSOIL publishes for motor oil, diesel oil and filtration—and what those numbers do and do not mean for your vehicle.

Use test data as evidence, not as a shortcut

Standardized laboratory tests make it possible to compare specific lubricant properties under controlled conditions. They are useful because they isolate wear, volatility, oil consumption, filtration efficiency and other characteristics. They do not replace the vehicle manufacturer's viscosity/specification requirements or guarantee the same percentage improvement in every engine.

Gasoline motor oil

Sequence IVA wear

AMSOIL reports 20.28 µm average cam wear for Signature Series 0W-20 against a 90 µm industry-standard limit in ASTM D6891.

Diesel oil

Caterpillar-1N oil consumption

AMSOIL reports 0.12 g/kWh for Signature Series versus the 0.50 g/kWh API CK-4 limit in the cited test.

Filtration

Efficiency at particle size

Full-flow and bypass filters serve different purposes. AMSOIL publishes 99% efficiency at 20 microns for its full-flow oil filters and 98.7% at 2 microns for its bypass media.

Diesel fuel

Fuel-additive claims

Diesel additive published benefit summary

AMSOIL's Diesel Injector Clean + Cetane Boost publishes up-to claims for cetane and fuel economy, plus injector cleaning and lubricity benefits.

Selected published claims and test context

Topic	Published result	Test / context
Signature Series gasoline wear	20.28 µm average cam wear vs. 90 µm industry standard	ASTM D6891 Sequence IVA, Signature Series 0W-20
Signature Series Max-Duty oil consumption	0.12 g/kWh vs. 0.50 g/kWh CK-4 limit	Caterpillar-1N oil consumption test
Max-Duty turbo cleanliness	Up to 60% better	AMSOIL cites CAT C13 2nd Ring Top Land Carbon standards
AMSOIL Oil Filter	99% efficiency at 20 microns	ISO 4548-12
AMSOIL Bypass Filter	98.7% efficiency at 2 microns	Published AMSOIL bypass-filter specification

Primary sources: AMSOIL Performance Tests, AMSOIL FAQ, and relevant product literature. We summarize the data rather than reproducing AMSOIL's charts.

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