I had used Mobil 1 !0W30 for many miles in my C230, the 10W30 was a Mercedes approved grade for many years and still is particularly in synthetic grade.
But for newer cars with FSS, Mercedes approved a particular sector of grades and manufacturers - strictly for the fact that the oil may stay in the sump for 12K miles or more.

You don't need to worry about Mobil-1 10W30 in your car

Don't worry about your oil, and make sure the brake fluid has been changed in the past two years, the coolant in the past three.
Your sunroof rails have been lubed. And give some thought to changing out the rear differential fluid.