you can change the interval notice by going into the menu. as far as changing at 4k I would think about switching to a synthetic like RP with a good filter like the RP synthetic and you could run 5k easily. It is really easy to change your own oil and it also ensures it is done correctly. I have heard horror stories about dealerships/oil change places using the incorrect oil or not changing the filter just to make the job go faster and save on overhead. It takes all of 15 min to change it yourself. Check the DIY section for what you need and pics of the change. And dont think I am a RP fan or sales man, i have just started using it for the past 10k and have been having good results with it first time with their filters but I plan to cut it open upon the next change.
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