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In diesel engines solid contamination is primarily fuel soot (carbon) from incompletely burned fuel blowing by rings and valve guides. Some amount of solids is quite normal and is the cause of routine oil blackening as additives hold minutely sized particles in suspension and carry these particles to the factory full flow filters for removal. However, the factory full flow filter is only efficient in the range of 10 microns and up. Most of these carbon particles generated are less than one micron in size. It is not until these particles combine with themselves (AGGLUTINATE) to form larger particles that the factory filters can remove this contamination.