What Is API Engine Oil? Diesel Engine

There are engine oils currently on the shelves at auto parts stores, gas station convenience stores, food stores, and other retail outlets that can cause harm to your car’s engine. Yes, you heard correctly – Cause harm to your car’s engine. These are obsolete engine oils formulated for use in cars built prior to the 1930s! Know how to read the labels on the front and back of the bottles of oil you buy or you may be using product that can cause unsatisfactory performance or harm to your engine. 

The service rating of passenger car and commercial automotive motor oils is classified by the American Petroleum Institute (API). The service rating is shown in the API “Service Symbol Donut” on the product label. As shown in the illustration below, engine oils with an API SA Service Classification were formulated for use in cars built prior to 1930, and are now obsolete. Yet, there are still not hard to find in retail outlets. Read on about what you need to read on the labels.

API SERVICE CLASSIFICATION FOR DIESEL ENGINE 

What is API? Diesel engine

API FA-4 and the FA-4 Donut identify certain XW-30 oils specifically formulated for use in select high-speed four-stroke cycle diesel engines designed to meet 2017 model year on-highway greenhouse gas (GHG) emission standards. API FA-4 oils are not interchangeable or backward compatible with API CK-4, CJ-4, CI-4 PLUS, CI-4, and CH-4 oils. Refer to engine manufacturer recommendations to determine if API FA-4 oils are suitable for use.

The service rating of passenger car and commercial automotive motor oils is classified by the American Petroleum Institute (API).

American Petroleum Institute Diesel Engine Oil Service Classifications

Category
Status
Service
CJ-4
Current
For high-speed four-stroke cycle diesel engines designed to meet 2010 model year on-highway and Tier 4 nonroad
exhaust emission standards as well as for previous model year diesel engines. These oils are formulated for use in all
applications with diesel fuels ranging in sulfur content up to 500 ppm (0.05% by weight). However, the use of these oils
with greater than 15 ppm (0.0015% by weight) sulfur fuel may impact exhaust aftertreatment system durability and/or
drain interval. CJ-4 oils are especially effective at sustaining emission control system durability where particulate filters
and other advanced aftertreatment systems are used. Optimum protection is provided for control of catalyst poisoning,
particulate filter blocking, engine wear, piston deposits, low- and high-temperature stability, soot handling properties,
oxidative thickening, foaming, and viscosity loss due to shear. API CJ-4 oils exceed the performance criteria of API CI-4
with CI-4 PLUS, CI-4, CH-4, CG-4 and CF-4 and can effectively lubricate engines calling for those API Service Categories.
When using CJ-4 oil with higher than 15 ppm sulfur fuel, consult the engine manufacturer for service interval.
CI-4 
Current
Introduced in 2002. For high-speed, four-stroke engines designed to meet 2004 exhaust emission standards implemented in 2002. CI-4 oils are formulated to sustain engine durability where exhaust gas recirculation (EGR) is used and are intended for use with diesel fuels ranging in sulfur content up to 0.5% weight. Can be used in place of CD, CE, CF-4, CG-4, and CH-4 oils. Some CI-4 oils may also qualify for the CI-4 PLUS designation.
CH-4
Current
Introduced in 1998. For high-speed, four-stroke engines designed to meet 1998 exhaust emission standards. CH-4 oils are specifically compounded for use with diesel fuels ranging in sulfur content up to 0.5% weight. Can be used in place of CD, CE, CF-4, and CG-4 oils.
CG-4
Obsolete
Introduced in 1995. For severe duty, high-speed, four-stroke engines using fuel with less than 0.5% weight sulfur. CG-4 oils are required for engines meeting 1994 emission standards. Can be used in place of CD, CE,and CF-4 oils.
CF-4
Obsolete
Introduced in 1990. For high-speed, four-stroke, naturally aspirated and turbocharged engines. Can be used
in place of CD and CE oils.
CF-2
Obsolete
OBSOLETE: Introduced in 1994. For severe duty, two-stroke-cycle engines. Can be used in place of CD-II oils.
CF
Obsolete
OBSOLETE: Introduced in 1994. For off-road, indirect-injected and other diesel engines including those using fuel with over 0.5% weight sulfur. Can be used in place of CD oils.
CE
Obsolete
CAUTION: Not suitable for use in most diesel-powered automotive engines built after 1994.
CD-II
Obsolete
CAUTION: Not suitable for use in most diesel-powered automotive engines built after 1994.
CD
Obsolete
CAUTION: Not suitable for use in most diesel-powered automotive engines built after 1994.
CC
Obsolete
CAUTION: Not suitable for use in most diesel-powered engines built after 1990.
CB
Obsolete
CAUTION: Not suitable for use in most diesel-powered engines built after 1961.​

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Wesmond is a premium quality lubricant crafted through 20 years of experience in the lubricant industry. Through comprehensive refinement with latest additive technology, Wesmond has produced possible the best engine oil in Malaysia for all vehicle types.

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