What Causes Blue Smoke from a Car's Exhaust Pipe?

[OSimon]

Car exhaust pipe emits blue smoke due to: oil leaking into the exhaust pipe, excessive clearance between pistons and cylinders, or piston ring seizure. When blue smoke appears from the exhaust pipe, the first step is to check whether there is oil in the exhaust pipe. If the valve stem seal is leaking oil, it will allow oil to seep into the exhaust manifold, causing high temperatures that produce blue smoke. Blue smoke from the exhaust pipe indicates "oil burning" in the car. Oil burning refers to excessive oil in the combustion chamber participating in combustion, which can lead to increased carbon deposits in the cylinders, incomplete combustion, reduced power, and may cause exposed combustion. The severe consequence of exposed combustion is that the engine may be completely scrapped. Additionally, it can result in unstable idling, lack of acceleration power, insufficient engine lubrication, leading to irreparable damage or scrapping of the engine.