BM 1 - 4T
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SAE 15W-50, API SJ - SYNTHETIC
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“C”- COMMERCIAL CLASSIFICATIONS FOR DIESEL ENGINES
API Service Category CF denotes service typical of off-road, indirect injected diesel engines and other diesel engines that use a broad range of fuel types, including those using fuel with higher sulfur content (over 0.5% wt sulfur fuel). Effective control of piston deposits, wear and corrosion of copper-containing bearings is essential for these engines, which may be naturally aspirated, turbocharged or supercharged. Oils designated for this service may also be used when API Service Category CD or CE is recommended. CF is a current specification.
API Service Category CF-2 denotes service typical of two-stroke cycle engines (such as Detroit Diesel) 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-II is recommended. These oils do not necessarily meet the requirements of CF or CF-4, unless they pass the test and performance requirements for these categories. CF-2 is a current specification.
Service typical of severe duty turbocharged, 4-stroke cycle diesel engines, particularly late models designed to give lower emissions. These engines are usually found in on-highway, heavy-duty truck applications. API CF-4 oils exceed the requirement of CE category oils and can be used in place of earlier CC, CD and CE oils. CF-4 oils provide for improved control of piston deposits and oil consumption.
The CF-4 classification meets Caterpillar’s 1k engine requirements, as well as earlier Mack Trucks (T-6 & T-7) and Cummins (NTC-400) multi-cylinder engine test criteria. When combined with the appropriate “S” category, they can be used in gasoline and diesel powered cars and light trucks as specified by the vehicle and/or engine manufacturer.
API Service Category CG-4 describes oils for use in high speed, four-stroke cycle diesel engines used in highway and off-road applications, where the fuel sulfur content may vary from less than 0.05% by weight to less than 0.5% by weight. 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 emissions standards and may also be used in engines requiring API Service Categories CD, CE and CF-4. Oils designated for this service have been in existence since 1995. CG-4 is a current specification
API Service Category CH-4 describes oils for use in high speed, four-stroke cycle diesel engines used in highway and off-road applications. CH-4 oils provide effective control over engine deposits, wear, corrosion, oxidation stability and soot accumulation. These oils are especially effective in engines designed to meet 1999 emission standards and may also be used in engines requiring API Service Category CG-4. Oils designated for this service have been in existence since 1999. CH-4 oils are engineered for use with diesel fuels ranging in sulfur content up to 0.5% weight. CH-4 is a current specification.
“S”- SERVICE CLASSIFICATIONS FOR GASOLINE ENGINES
Classification SH was adopted in 1992 and recommended for gasoline engines in passenger cars and light trucks starting in 1993 model year. This category supercedes the performance requirements of API SG specification for 1989-1992 models, which is now obsolete. Applications that call for an API service classification SG can use the SH specification. The specification addresses issues with deposit control, oxidation, corrosion, rust and wear and replaces.
Classification SJ was adopted in 1996 and recommended for gasoline engines in passenger cars and light trucks starting in 1997 model year. Applications specifying API SH can use the newer API SJ service classification. Note that where applicable certain letters in the sequence will be skipped to prevent confusion with other standards. In this case, SI was skipped since industrial oils are currently rated according to SI classifications.
Recommended for gasoline engines in passenger cars and light trucks starting in July 2001. SL oils are engineered to provide improved high temperature deposit control and lower oil consumption. Applications specifying API SJ can use the new API SL service classification. Note that some SL rated oils may also meet the latest ILSAC specification and/or qualify as energy conserving. SL is the latest specification.
SM- For 2004 and newer Gasoline Engine Service Automotive Engines (Current Spec)
This specification was introduced in Nov. 2004. SM oils are engineered to provide improved oxidation resistance, improved deposit and wear protection and improved low temperature performance. Note that some SM rated motor oils may also meet the current ILSAC specification.