ASE G1 Auto Maintenance and Light RepairEngine SystemsMedium
When performing an oil change, a technician notices significant metallic particles (shavings) in the old engine oil. What does this condition most likely indicate?
- AExcessive internal engine wear, possibly bearing or camshaft damage.
- BContamination from external sources entering the oil system.
- CNormal wear and tear for high-mileage engines.
- DOver-tightening the oil filter during the previous service.
Show answer & explanationAnswer & explanation
Correct answer: A. Excessive internal engine wear, possibly bearing or camshaft damage.
Significant metallic particles or shavings in the engine oil are a serious indicator of excessive internal engine wear. This often suggests damage to components like crankshaft bearings, camshafts, or piston skirts, which requires immediate attention to prevent catastrophic engine failure.
Why the other options are wrong
- B. External contamination is less likely to introduce metallic shavings; it would typically be dirt, debris, or other fluids.
- C. While some microscopic wear particles are normal, 'significant metallic particles' are not normal wear and tear.
- D. Over-tightening the oil filter primarily causes sealing issues or difficulty in removal, not metallic particles in the oil.
Metallic Particles in Oil
Presence of visible metallic flakes or shavings in engine oil, signaling severe internal engine component wear or damage.
- Indicates friction and abrasion of moving parts.
- Common sources: bearings, camshaft, piston skirts, cylinder walls.
- Requires immediate diagnosis and repair to prevent engine failure.
Memory trick: Shiny bits in oil, engine's in turmoil!