Oil--good oil especially--is insurance. Pick an interval that is reasonable, but also not too short (you do appreciable wear each time the engine is cranked over on a new fill of oil and isn't fully lubricated yet). 5,000-7,500 is pretty reasonable (to me) for a forced induction daily driver, with a top-shelf full synthetic engine oil and filter. Compared to an NA engine, you will have to combat blow-by also when it comes to oil and potential consumption issues, and you have the life of the turbo's bearing to consider. We have a tiny, tiny turbo that spins early, hard, and often.