Check oil sensor for E63/CLS63
Went to the dealer the last time it came up (around 6.9k miles) and the technician told me that they didn't add enough oil the last time I went to the dealer for the same reason (check oil).
Just go to your service dept and ask for the technician to add more oil.
Take a nice highway trip next weekend and let her run.
Here is a link of early CLS 63 oil topic.
https://mbworld.org/forums/c219/187870-recall-cls-63-a.html
My car had the oil light come on 1 time when it needed 1 qt added. Change it every 3k. I do not know of any 63 experiencing the problem you describe






