Does Oil Spray from the Exhaust Port Require an Overhaul?

[AndrewLee]

Whether oil spray from the exhaust port requires an overhaul depends on the specific situation: if it is a slight oil spray, it will not cause any impact; if it is severe oil spray, the exhaust port will need an overhaul. Reasons for oil spray from the exhaust port: 1. Cylinder blow-by; 2. Clogged crankcase breather; 3. Excessive crankcase pressure; 4. Oil retention in the cylinder. Methods to troubleshoot oil spray from the exhaust port: 1. Check if there is excessive oil added; 2. Open the oil filler cap, start the engine, and check the amount of exhaust gas coming out of the oil filler cap—if it is too large, it may indicate piston ring leakage, requiring replacement of the piston rings; 3. Check if the vacuum tube is clogged.