Heavy Duty Equipment Technician Red Seal Exam Prep · Question
A used oil analysis report for a diesel engine shows significantly elevated levels of silicon and aluminum, with a corresponding increase in iron. The lubricant currently in use is a premium 15W-40. What is the most probable cause of these results?
Elevated silicon indicates dirt/dust ingress, while aluminum and iron suggest component wear. The combination points strongly to abrasive dust entering the engi
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Question: A used oil analysis report for a diesel engine shows significantly elevated levels of silicon and aluminum, with a corresponding increase in iron. The lubricant currently in use is a premium 15W-40. What is the most probable cause of these results?
Answer options:
- Coolant contamination due to a head gasket leak.
- Fuel dilution caused by injector issues. ✅ Ingress of abrasive dust through a faulty air intake system.
- Excessive blow-by past worn piston rings.
Correct answer: Ingress of abrasive dust through a faulty air intake system.
Explanation: Elevated silicon indicates dirt/dust ingress, while aluminum and iron suggest component wear. The combination points strongly to abrasive dust entering the engine, likely through a compromised air intake system, causing wear on aluminum pistons and iron cylinder liners.
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