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I have a newbie question. How do you know when to take your car in for scheduled maintenance? Is this dependent on the service info found on your iDrive or instrument cluster? Or are there actually intervals such as every 15000 miles regardless if the car says its time for service. My car is just over 15k and the service info display says oil should be changed in 8000 miles. I assume they will flush the DEF system and replace the fluid when the oil gets changed.
I'm wondering if it's absolutely required to have your DEF system flushed every oil change, even after the complimentary maintenance has expired. Wouldn't it be sufficient to continue just topping up with AdBlue urea fluid? If flushing the system at every oil change is required to maintain the DEF system long term it would be nice if there was a user friendly way to flush your own DEF system. At least for those that do all their own maintenance after the complimentary maintenance.
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