A3 rating

[Big Dave]

I was wondering what the A3 rating refered to.

Thanks!

David

 

[G-MAN]

A3 is a spec of the ACEA, the European Automobile Manufacturers Association.

quote:

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A3 Stable, stay-in-grade oil intended for use in high performance gasoline engines and/or for extended drain intervals where specified by the engine manufacturer, and/or for year-round use of low viscosity oils, and/or for severe operating conditions as defined by the engine manufacturer.

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[CosmicFlash]

I believe a shear index of >3.5 is also a criteria.

 

[Quattro Pete]

Big Dave,

G-Man II already gave you a basic definition. If you're interested in the exact specs than an A3 oil has to meet, check out pages 21-23 of this document:
http://www.ethyl.com/products/la/handbook/Crankcase.pdf