I would ignore the FSS system and lifetime trans fluid schedule.

Change the engine oil and filter every 5,000 miles. Use Mobil 1 0W-40.

Change the transmission oil and filter every 30,000 miles. You must use M-B synthetic fluid in trans and need to buy a dipstick at the dealer. You also need a clip to "reseal" the dipstick tube.

I would do the differential at 30,000 miles also.

Brake fluid flush every 2 years.

I would change the coolant every three years. Use M-B coolant.

You can reset the FSS dash display with instructions in the Owners Manual.