For all engine oil samples examined by OELCHECK, two additional values are reported with the CCD photometer.
Pollution in %.
This value refers to the soot particles and combustion residues contained in the oil. It is determined from the intensity of the black coloration of the spot.
Dispersancy is calculated based on the different diameters of the annular black deposits on the spot.
It is given as a value between 20 and 100. A value of 100 represents a fresh oil. The lower the dirt carrying capacity value, the less the oil's additive package is able to carry soot and dirt. A value lower than 30 indicates that the oil does not prevent deposits in the engine.