I bought a dipstick on Amazon for my Audi A4 2.0T Quattro. I had to cut the dipstick ring hand holder in half so it didn't hit the hood when closing it. Then I added a half quart of oil in the engine. Then when I went to check the oil, first with the dipstick, then on the MMI display to see if they matched. The MMI oil reading said it was unavailable at this time. I wasn't sure why it wasn't reading it. Was it because I installed the new dipstick or because I added oil. It's a newly purchased used Audi A4 2.0T Quattro and this is the first time I needed to add oil. Anyway, I was very disappointed that the MMI display wasn't working. I thought maybe the new dipstick was interfering with the reading sensor. But to my relief after a few days, the MMI displayed the oil levels like it did previously.