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.
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