Fuel Soot - Lubricating Oil Analysis
Fuel soot is composed of carbon and is always found in diesel engine oil. Laboratory testing is used to determine the quantity of fuel soot in used oil samples. Stringent exhaust emission regulations have placed greater emphasis on fuel soot levels. One of the most significant impacts of reduced emissions is control of particulate emissions, which resulted in greater soot levels in the crankcase. The fuel soot level is a good indicator of engine combustion efficiency and should be monitored on a regular basis for possible maintenance action.
Cause
• Improper air/fuel ratio
• Improper injector spray pattern
• Poor quality fuel
• Incomplete combustion
• Clogged air induction
• Defective injectors
• Improper equipment operation
• Low compression
• Worn piston/rings
Effect
• Poor engine performance
• Harmful deposits or sludge
• Increased wear
• Shortened oil life
• Lacquer formation
• Clogged oil filters
Solution
• Ensure fuel injectors are working properly
• Change oil
• Evaluate oil drain intervals
• Check compression
• Avoid excessive idling
• Check fuel quality
