ACEA :	The European Automobile Manufacturers’ Association (or Association des Constructeurs Européens d’Automobiles)
API :	American Petroleum Institute
C :	Diesel engines
HVI :	High Viscosity Index
MTU :	Maximum Transmission Unit
S :	Gasoline engines
SAE :	Society for Automotive engineers
STOU :	Super tractor oil universal
UTTO :	Universal Tractor Transmission Oil
ACEA A3/B3 :	Stable, stay-in-grade Engine Oil intended for use in Passenger Car & Light Duty Van Gasoline & 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.
ACEA A3/B4 :	Stable, stay-in-grade Engine Oil intended for use in Passenger Car & Light Duty Van Gasoline & DI Diesel Engines, but also suitable for applications described under A3/B3.
ACEA A5/B5 :	Stable, stay-in-grade Engine Oil intended for use at extended Drain Intervals in Passenger Car & Light Duty Van Gasoline & Diesel Engines designed to be capable of using Low Viscosity Oils with HTHS Viscosity of 2.9 to 3.5 mPa*s. These Oils are unsuitable for use in certain Engines – consult vehicle-OEM’s owner’s manual/handbook in case of doubt.