API FA-4 describes 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. These oils are formulated for use in on-highway applications with diesel fuel sulfur content up to 15 ppm.*
API FA-4 oils are blended to a high-temperature high-shear (HTHS) viscosity range of 2.9 cP to 3.2 cP to assist in reducing GHG emissions. These oils are especially effective at sustaining emission control system durability where particulate filters and other advanced after-treatment systems are used.*
API FA-4 oils are designed to provide enhanced protection against oil oxidation, viscosity loss due to shear, and oil aeration, as well as protection against catalyst poisoning, particulate filter blocking, engine wear, piston deposits, degradation of low- and high-temperature properties, and soot-related viscosity increase.*
Although many new heavy-duty engines are now being factory-filled with FA-4 engine oils, there are no OEMs that require the use of a FA-4 engine oil. Thus, heavy-duty fleets can utilize CK-4 oils if they choose.
For fleets considering whether to use FA-4 oils, the following list provides general OEM guidelines:
Caterpillar: API FA-4 is not allowed in any CAT engines.
Cummins: API FA-4 (CES 20087) can be used in greenhouse gas (GHG) 2017-and-newer X-15 engines and 2018-and-newer X-12 engines only.
Detroit Diesel: API FA-4 (DFS 93K223) can be used in all EPA 2010 and newer engines.
Navistar: API FA-4 can be used in Navistar trucks using Navistar GHG 2017 A26 and N13 engines only. API FA-4 (CES 20087) can be used in Navistar trucks using Cummins GHG 2017-and-newer engines listed above.
PACCAR: API FA-4 is not allowed in PACCAR trucks using PACCAR MX-11 and MX-13 engines. API FA-4 (CES 20087) can be used in PACCAR trucks using Cummins GHG 2017-and-newer engines listed above.
Volvo/Mack: API FA-4 is not allowed in any Volvo/Mack engines.
To determine the proper engine oil for each engine type in your fleet, please be sure to refer to individual engine manufacturer
recommendations regarding engine-oil compatibility.
Should you have questions, please reach out to your Castrol® sales or field engineering representative.