What API oil classification is recommended for engines fueled by ultra low sulfur (ULS) fuel?
A) CJ-4
B) CK-4
C) FA-4
D) All of the above

Question

Quizplus · Accepted Answer

All of the above classifications (CJ-4, CK-4, FA-4) are designed to be compatible with engines using ultra low sulfur (ULS) fuel. CJ-4 was introduced for high-speed four-stroke engines designed to meet 2007 exhaust emission standards. CK-4 and FA-4 are newer specifications that provide better protection and can help improve fuel economy.

What API Oil Classification Is Recommended for Engines Fueled by Ultra