Oil leakage around the cylinder block
When using the car daily, you can check the oil level and visually check whether there are traces of oil seepage around the cylinder block. Before driving, check whether there are oil stains under the chassis, but it should be noted that when the air conditioner is turned on in summer, water will drip under the car, which is a normal phenomenon, so pay attention to distinguish between water stains and oil stains.
Oil leakage around the engine valve cover is relatively common. Usually, replacing the valve cover gasket can solve the problem. However, if the crankcase ventilation device does not work properly, resulting in excessive pressure inside the engine, only replacing the gasket cannot solve the oil leakage. For turbocharged engines, if there is a lot of oil in the intercooler connecting pipe, usually the turbocharger seal has failed, and the turbocharger needs to be replaced.