fd56ec0a_MOTOR_OIL_GUIDE__Use___Definition
[API Symbol] SG (obsolete) (1989 Gasoline Engine Warranty Maintenance Service) [Use & Definition] 
Service typical of gasoline engines in passenger cars, vans and light trucks beginning with the 1989 model year operating under manufacturer's recommended maintenance procedures. Category SG quality oils include the performance properties of API Service Category CC. (Certain manufacturers of gasoline engines require oils also meeting API Service Category CID). Oils developed for this service provide improved control of engine deposits, oil oxidation and engine wear relative to oils developed for previous categories. These oils also provide protection against rust and corrosion. Oils meeting API Service Category SG may be used where API Service Categories SF, SE, SF/CC or SE/CC are recommended.
MOTOR OIL GUIDE
Use & Definition