A few days ago I had a problem with reverse gear. He just disappeared, so I just drove forward to the nearest workshop and left them the car to be repaired. after about 3 hours I have a phone that the gearbox needs to be changed and that the oil in it was like a medicine. They asked whether to look into the chest or leave it alone, so I leaned so that they would not move and I would come up with something. They also suggested replacing the pillows under the box and the engine, because they noticed some vibrations that I had no idea about before. I agreed because I thought maybe something was vibrating and I got used to it. After about an hour they call that it is backward, but they could not explain what was the reason for his disappearance. They said they were still waiting for pillows and in a few hours it would be ready for pickup. Glad I went for the car after the next phone call and actually the reverse worked, but they refilled my oil not as I thought GR5 75W-90 only (Elf) NFJ 75W-80 . Maybe it doesn't matter, I don't know, but I felt it a lot of steering wheel vibration at idle and strange humming in the cabin while driving (unless the vibrations are transferred to the cabin), which was not before. So I came to them asking why it was so and he tells me that the pillows have to be arranged. I've done about 200km since then and no changes. Maybe you have an idea where these vibrations and this buzzing in the car .... And whether the oil is OK.