What Causes Oil in the Intake Pipe?
2 Answers
Oil in the intake pipe is caused by a dirty air filter. Detailed reasons and solutions for oil in the intake pipe are as follows: Detailed Reasons: Prolonged engine idling; Dirty air filter; Blocked or deformed crankcase ventilation system; Blocked, leaking, or deformed turbocharger oil inlet and return pipes; Coking of lubricating oil in the turbocharger's intermediate housing; Cylinder wear causing piston ring blow-by; Excessive flow resistance in the exhaust system. Solutions: Check the intake side oil seal and replace it promptly if worn; Inspect the piston rings and replace them immediately if they are aged, have lost elasticity, or are broken; Examine the seal of the turbocharger compressor impeller side sealing ring and replace it promptly if the seal is not tight to ensure a proper seal.
I've encountered the issue of oil in the intake pipe several times. It's mostly caused by internal engine problems, such as worn piston rings or damaged valve stem seals, allowing oil to seep into the intake pipe through gaps, accumulating over time. This leads to excessive oil entering the combustion chamber, resulting in sluggish acceleration, blue smoke emissions, and increased fuel consumption if left unattended for long periods. It may even damage the spark plugs. I recommend first checking the crankcase ventilation system (PCV valve) – if it's clogged, the high pressure can force oil into the intake. Regular oil changes and using high-quality filters can significantly reduce this risk, especially crucial for older vehicles. Otherwise, repair costs could rise substantially. If the problem persists, take it to a professional shop immediately to prevent it from escalating into a major issue that compromises driving safety.
