A year ago, I drove 4,000 kilometers after 4S maintenance. A few days ago, I checked the oil gauge and found that the oil was 1 cm higher than the normal oil level and had a slight smell of gasoline. Yan recommended checking it as soon as possible. A few days ago, I went to the repair shop. The repair shop said that this phenomenon is relatively rare. It may be a problem with the oil nozzle or the high-pressure pump, but it is impossible to determine which one is the problem. I can only change the high-pressure pump or the oil nozzle first, and then replace it with another one. I don’t think it is reliable. Yesterday, I went to the front desk of the 4S store and said that a leaking oil pipe was a common problem. Replacement cost more than 600 yuan. Let’s check first. The maintenance master checked and said that the smell of gasoline was not obvious and the oil level was indeed high. He said that there was no leakage of oil pipes. He only removed the lower guard plate but not the engine. After looking at it for a long time, he still didn’t know the reason. He said that it is rare for the M271 to increase the amount of engine oil. The color of the oil is normal. It should not be that it was antifreeze, and it is rare for the oil to be injected into gasoline. Finally, he pumped the oil to a normal position and said that it would be driven for a while to see if it was still high. The inspection said that a pair of vertical rods were broken for 1800 yuan, the oil filter base should be replaced for about 6000 yuan for leaking oil, and the thermostat should be replaced for about 2000 yuan for leaking water. The 4S charge was indeed high and it has not been replaced for the time being. Finally, the water tank and throttle were cleaned. It seems that the 4S maintenance master is not very proficient. At present, we can only open it for observation first. The specific reason is not yet known. By the way, the master said that the computer showed that another camshaft also gave an alarm, but the fault light did not turn on. Two years ago, the intake camshaft was replaced at 86,000 kilometers, and now it is just 100,000 kilometers.