A3 / B3 Stable, stay -
in - grade oil intended for use
in high performance
gasoline engines and car & light van diesel
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.
So if you're a service manager or fleet manager and you have a fleet of plug -
in hybrids, the car will need the same kind of service that it always needs for the
gasoline engine, but the
gasoline engine will be used a lot less, so the
intervals will extend.