1. Overfilled Oil:
- If the oil level in the engine is too high, excess oil can enter the combustion chambers, causing a smoky exhaust.
2. Incorrect Oil Type:
- If the wrong type of oil is used, it may not provide proper lubrication and can cause excessive engine wear, leading to smoke.
3. Leakage:
- Check for oil leaks around the oil filter, oil pan, and valve cover. Oil leaking onto the engine's hot components can burn, producing smoke.
4. Worn Piston Rings or Seals:
- Worn piston rings or seals can allow oil to seep past them, causing smoke from the exhaust. This issue is more likely if your Montero Sport has high mileage.
5. Faulty PCV (Positive Crankcase Ventilation) Valve:
- A malfunctioning PCV valve can cause excessive pressure buildup in the crankcase, pushing oil into the combustion chamber and creating smoke.
6. Turbocharger Issues (if applicable):
- If your Montero Sport has a turbocharger and it's malfunctioning, it may push oil and cause it to burn in the exhaust.
7. Coolant Leak into the Exhaust:
- In rare cases, a coolant leak into the exhaust system can cause white smoke to be emitted from the exhaust. Check for any coolant level drops and visible coolant leaks.
If the smoking issue persists or if your Montero Sport starts exhibiting other symptoms like rough idling, engine knocking, or loss of power, it's advisable to take it to a qualified mechanic for proper diagnosis and repairs.
