There is one question when replacing the rear differential oil._vehicles, vehicles

There is one question when replacing the rear differential oil.

September 7, 2024

The car is a 2018 model, the M274, and has been 25,000 kilometers long. After reading the strict version of the tutorial on replacing rear differential oil, my heart has been itchingCan’t wait. It just happens that I have time to change over the weekend, so I feel good.
Here are some photos for everyone to see。
The new differential oil I prepared is Ansuo 80w90, which is enough here in Fujian. Two bottles only cost 220, so fragrant。It seems that the shelf life of the bottle label is 5 years, which is completely in line with Yan Ban’s replacement of about 40,000 kilometers.
Replace it strictly according to the tutorial issued by Yan Edition, and the differential oil that was replaced is gray. Looking at the bottom of the old oil, there were no obvious metal debris. I usually don’t drive to work, so I’ll see how it feels in two days.
I took 4 photos of the oil change screws of the rear differential, and the oil drain screws and refueling screws are the same.
There is one question. Before removing the screws, I found a little oil stain on the bottom of the differential, but it was very slight. When I was removing the refueling screw, I heard a bang. It is speculated that the pressure in the differential is higher than atmospheric pressure and the oil pressure is released. Please consult the next strict version, is the inside of the rear differential cavity sealed?