MOTOR OIL GUIDE

API Symbol	Use & Definition
SG (obsolete) (1989 Gasoline Engine Warranty Maintenance Service)	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.
SH (1993 Gasoline Engine Warranty Maintenance Service)	Service typical of gasoline engines in present and earlier passenger cars, vans and light trucks operating under vehicle manufacturer recommended maintenance procedures. Engine oils developed for this category provide performance exceeding the minimum performance requirements for API SG, which it is intended to replace, in the areas of deposit control, oil oxidation, wear, rust and corrosion. Engine oils meeting the API SH designation have been tested according to the Chemical Manufacturers Association (CMA) Product Approval Code of Practice, may utilize the API Base Oil Interchange and Viscosity Grade Engine Testing Guidelines and may be used where API Service Category SG and earlier categories have been recommended.
SJ (1997 Gasoline Engine Warranty Maintenance Service)	API Service Category SJ was adopted for use in describing engine oils available in 1996. These oils are for use in service typical of gasoline engines in current and earlier passenger car, sport utility vehicle, van, and light truck operations under vehicle manufacturers' recommended maintenance procedures. Engine oils that meet the API Service Category SJ designation may be used where API Service Category SH and earlier categories have been recommended. Engine oils that meet the API Service Category SJ designation have been tested in accordance with the CMA Code, may use the API Base Oil Interchangeability Guidelines and the API Guidelines for SAE Viscosity- Grade Engine Testing. Engine oils that meet these requirements may display API Service Category SJ in the upper portion of the API Service Symbol.
CA (obsolete) (Light Duty Diesel Engine Service)	Service typical of diesel engines operated in mild to moderate duty with high quality fuels and occasionally has Included gasoline engines in mild service. Oils designed for this service provide protection from bearing corrosion and from ring belt deposits in some naturally aspirated diesel engines when using fuels of such quality that they impose no unusual requirements for wear and deposit protection. They were widely used in the late 1940's and 1950's but should not be used in any engine unless specifically recommended by the equipment manufacturer.
CB (obsolete) (Moderate Duty Diesel Engine Service)	Service typical of diesel engines operated in mild to moderate duty, but with lower quality fuels which necessitate more protection from wear and deposits. Occasionally has included gasoline engines in mild service. Oils designed for this service were introduced in 1949. Such oils provide necessary protection from bearing corrosion and from high temperature deposits in normally aspirated diesel engines with higher sulfur fuels.
CC (obsolete) (Moderate Duty Diesel and Gasoline Engine Service)	Service typical of lightly supercharged these I engines operated in moderate to severe duty and has included certain heavy duty gasoline engines. Oils designed for this service were introduced in 1961 and used in many trucks and In industrial and construction equipment and farm tractors. These oils provide protection from high temperature deposits in lightly supercharged diesels and also from rust, corrosion, and low temperature deposits in gasoline engines. API Symbol Use & Definition CD (obsolete)(Severe Duty Diesel Engine Service) Service typical of supercharged diesel engines in high speed, high output duty requiring highly effective control of wear and deposits. Oils designed for this service were introduced in 1955, and provide protection from bearing corrosion and from high temperature deposits in supercharged diesel engines when using fuels of a wide quality range. CD-11 (obsolete) (Two-Stroke Diesel Engine Service) Service typical of two-stroke cycle diesel engines requiring highly effective control over wear and deposits. Oils designed for this service also meet all performance requirements of API Service Category CD. CE (obsolete) (Turbocharged or Supercharged Heavy Duty Diesel Engine Service) Service typical of turbocharged or supercharged heavy duty diesel engines manufactured since 1983 and operated under both low-speed, high-load and high-speed, high-load conditions. Oils designed for this service may also be used when previous API engine service categories for diesel engines are recommended. CF (indirect Injected Diesel Engine Service) This Category denotes service typical of indirect injected diesel engines, and other diesel engines which use a broad range of fuel types including those using fuel with higher sulfur content, for example, over 0.5% wt. Effective control of piston deposits, wear and copper-containing bearing corrosion is essential for these engines which may be naturally aspirated, turbocharged or supercharged. Oils designated for this service have been in existence since 1994. Oils designated for this service may also be used when API service category CD is recommended. CF-2 (Two Stroke Cycle Diesel Engine Service) This Category denotes service typical of two-stroke cycle engines requiring highly effective control over cylinder and ring-face scuffing and deposits. Oils designated for this service have been in existence since 1994 and may also be used when API Service Category CD-his recommended. These oils do not necessarily meet the requirements of CF or CF-4 unless passing test requirements for these categories. CF-4 (1990 Diesel Engine Service) This category was adopted in 1990 and describes oils for use in high-speed, four-stroke-cycle, diesel engines. API CF-4 oils exceed the requirements of the CE category providing improved control of oil consumption and piston deposits. These oils should be used in place of CID oils. They are particularly suited for on-highway, heavy duty truck applications. When combined with the appropriate "5" category, for example SG, they can also be used in gasoline and diesel powered personal cars such as automobiles, light trucks and vans when recommended by the car or engine manufacturer. CG-4 (Severe Duty Diesel Engine Service) This Category describes oils for use in high-speed four-stroke cycle diesel engines used on both heavy-duty on-highway (less than 0.05% wf. sulfur fuel) and off highway (less than 0.5% wt. sulfur fuel) applications. CG-4 oils provide effective control over high temperature piston deposits, wear, corrosion, foaming, oxidation stability and soot accumulation. These oils are especially effective in engines designed to meet 1994 exhaust emission standards and may also be used in engines requiring API Service Categories CID, CE and CF4. Oils designated for this service have been in existence since January 1995.