Solids and Fuel Soot
Incorrect fuel pump and/or injector calibration is the most common cause of excessive quantities of fuel soot. This category represents the total measurement of all solid and solid-like materials found in oil samples.

In diesel engines the primary portion of this measure is fuel soot, followed by metal particles and oxidation products. Incorrect fuel pump and injector calibration is the most common cause of excessive quantities of fuel soot in diesel engines. Accumulated soot can clog galleries, block oil filters and thicken oil until it becomes sluggish, therefore accelerating engine wear.
In non-diesel engines the main pollutants are wear debris and oxidation products.

Causes Effects
Incorrect fuel pump and injector calibration Increased Wear
Poor quality fuel Decreased engine performance
Incomplete combustion Increased viscosity
Restricted air filter Corrosion of metal parts
Defective injectors Increased acidity in lubricant
Improper equipment operation Restricted lubricant flow
Low compression Blocked oil filters
Worn engine parts  
Low turbocharger boost  
Recommendations
Ensure injectors are calibrated correctly
Check fuel pump calibration
Analyse driver/operating techniques
Check turbocharger

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