Thinking about this a bit more, the E has a service interval of 1 year/20,000 miles, but what's the point of that when it has an oil life remaining %age and I'd hazard a guess not 1 person will hit 0% at exactly that date or mileage figure so why not make it 1 year/as per oil life indicator - whichever is sooner.
I mean, let's say theoretically my oil life % goes to 0 at 6 months and with 10,000 miles covered, should I get it serviced then because the oil life is 0% or continue to drive the car for another 6 months/10,000 miles until its reached the service interval mileage/time, its all a bit confusing, why bother having a life % if you have a date and mileage, and why bother with a date and mileage if you have a %, just do it as and when the % goes to 0 :?
Also if you are doing a lot of frequent town or stop start driving (most days the only drive my car gets is 10 miles of rush hour, queing or stop start motorway traffic there and back to work) should you replace the oil and filter more frequently even if the oil life %age is OK, or is it designed in such a way it will detect its doing lots of journeys putting a lot more strain on the car than motorway cruising at high speeds for long distances and reduce the oil life quicker automatically.