Incorrectly mixing the oil and fuel can cause the engine to smoke excessively if the ratio of oil is too high.
Piston Rings or Cylinder Bore Worn:
Worn piston rings or cylinder bore can allow engine oil to enter the combustion chamber, causing the engine to smoke.
Valve Stem Seals Leaking:
Leaking valve stem seals can lead to engine oil entering the combustion chamber and smoking.
Damaged Head Gasket:
A damaged head gasket can allow engine oil to leak into the combustion chamber and smoke.
Faulty Oil Control Valve (OCV):
A faulty Oil Control Valve (OCV) can cause engine oil to enter the combustion chamber, resulting in smoking.
Blocked Oil Drain
A blocked oil drain can cause oil to build up and enter the combustion chamber.