Is it normal to have engine oil in the crankcase vent tube?
1 Answers
If it's a slight amount of engine oil, it is a normal phenomenon because the crankcase vent tube will have slight oil vapor entering. However, if there is a large amount of engine oil, it is abnormal and indicates that the turbocharger has an oil burning issue. Reasons for having engine oil: There are many reasons that can cause engine oil in the intake pipe, including driving conditions, maintenance, normal crankcase ventilation, etc. This is determined by the characteristics of the turbocharger and the layout of related systems. Prolonged engine idling, clogged or deformed crankcase ventilation system, and coking of lubricating oil in the turbocharger's intermediate housing can also lead to this issue. Effects of excessive engine oil: If the engine oil is overfilled, it will inevitably increase the lubricating oil content in the crankcase ventilation system, thereby promoting the entry of lubricating oil from the crankcase ventilation system into the intake pipe.