My Honda S2000 had 3 oil changes at dealer because it was free. All other oil changes had been done in my garage when I feel like to do it(within a month of 1 year OCI).
The E430 was the same, all dealer oil changes were free, after those free oil changes I did it in my garage.
Why spent 1-2 hours at dealer plus time driving there for something you can do for 30 minutes and when you please.