Model 21 530LI, 17000 kilometers second guarantee, cylinder 1 and 2 spark plugs have oil and carbon deposits
VenusPulitzer 
14 
On the fourth day of the Lunar New Year, the car reached 17000 kilometers and went to the 4S shop for a second maintenance.
Recently, everyone in the forum has been talking about the problem of organic carbon caused by burning oil in cylinders 1 and 2 of B48TU machines. I felt that my car had not run away, so I asked the master to remove the spark plug first.
After disassembling it, it was found that there were serious carbon deposits in cylinders 1 and 2, and there was engine oil in the thread positions; cylinders 3 and 4 had no engine oil, and there was not as much carbon deposits as cylinders 1 and 2.
My car was filled with a bottle of poisonous fuel additive for 10,000 kilometers.
After that, add a bottle of Anso’s fuel additive about 500 kilometers each time.
Compared with the carbon deposits on the surface of the spark plug of cylinders 1 and 3, oil stains can also be seen on the spark plug of cylinder 1. The master of the 4S shop said that it may be that the engine cylinder head is not airtight enough. BMW manufacturers should be aware of this problem and have special business guidance and training. In the follow-up, you need to send an email to the manufacturer first, and after the manufacturer confirms, you will give advice on handling it. On the fourth day of the same day, when no one was working at the factory, the spark plug was not replaced. It was replaced again and replaced after work. Other maintenance was done first.
Compared with the new filter element after running 17000 kilometers, the air filter element is quite dirty.
The two air conditioning filter elements are also quite dirty. The price is 1017 yuan for working hours, which is quite expensive. Let’s change it outside next time.
After running 8000 kilometers of engine oil, it was completely black.
I discussed with the master and added 5.25 liters of engine oil and took half a liter with me. Because I added 5.75 liters after the last maintenance, I found that the power was not as smooth as before. The intuitive feeling was that after the first maintenance, the throttle became heavier, the throttle response became slower, and the fuel consumption increased. It only improved after running 5000 kilometers. This may be the reason why the great god said in the forum that there was oil consumption, but it was still within the maximum range, so the oil volume display was still full.
Second guarantee list.
To replace the spark plug today, you need to first open the engine cylinder head, take photos, and send them to the manufacturer. Wait for the manufacturer to analyze the results before finally determining how to repair it. It is estimated that the maintenance master knows what is going on, or how dare he easily remove the engine cylinder head.
After changing the oil, I ran for more than 100 kilometers for 3 days. The oil on the spark plugs of cylinders 1 and 2 was obviously more than when the last time I ran 17000 kilometers, and there were also oil stains on cylinders 3 and 4.
The engine head was lifted off, photographed and confirmed by the manufacturer. After waiting for a day without receiving a reply from the manufacturer, the car could only be left in the store without a scooter.
The gasoline filter element is in the red circle.
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