Oils with tolerance (specification) API CI-4 (class introduced in 2002)
These motor oils are used in modern diesel engines with various types of injection and supercharging. Motor oil corresponding to this class must contain appropriate detergent-dispersing additives and has, in comparison with the class CH-4, increased resistance to thermal oxidation, as well as higher dispersing properties.
In addition, such motor oils provide a significant reduction in engine oil smoke due to reduced volatility and reduced evaporation at an operating temperature of up to 370 ° C, under the influence of gases.
The requirements for cold pumpability have also been strengthened, the resource of gaps, tolerances and seals of the motor has been increased due to the improvement of oil fluidity.
Class API CI-4 was introduced in connection with the emergence of new, more stringent requirements for the ecology and toxicity of exhaust gases, which are required for engines produced after October 1, 2002