I perform the service when the computer tells me to, sometimes 1-2k miles sooner. I don't have any problem with a computer tracking when service is needed. In fact, I wish it would remind me of tire rotation, coolant change, and brake bleed jobs too. How is this different than you writing down on a pc of paper and reminding yourself to do something?

Since my E320 holds 8 qt of oil, I am not bothered by the extended oil change intervals. I do use Mobil One per recommendation. At $4/qt and $11/filter, it's not necessary to change oil every 3k mi and not worth saving money using dino juice and doing more frequent changes.

Enjoy the technology and worry about other things in life that's more important than oil changes. Let the computer help you.