1. Oil Pressure Failure: Engine "Thrombosis" Crisis

When excavator oil exceeds service life:

• Low pressure: Insufficient lubrication → Dry friction → Bearing seizure, cylinder scoring

• High pressure: Clogged oil passages → Filter blowouts → Carbon buildup explosion

2. Sludge Invasion: Excavator Becomes "Scrap-Maker"

Degraded oil + combustion waste + metal debris = Gel-like sludge:

• Clogged filters/oil holes → Lubrication system collapse

• Seized piston rings → 30% engine power loss

3. Core Component Wear: Costly Overhaul Inevitable

Piston & cylinder first victims:

• Failed oil film → Metal-on-metal friction → Cylinder scarring

• Sintered bearings → Turbocharge

4. Overheating Meltdown: Engine "Fever" Deformation

Semi-dry friction generates extreme heat:

• Cracked cylinder heads → Cooling system failure

• Sudden shutdowns in summer → Project delays

5. Hidden Costs: Fuel Waste + Value Halved

• 10%-15% fuel efficiency drop → Wastes $10,000s yearly

• 40% resale value loss due to engine damage history