did it both in my saturn and my civic and the way i look at it is this, if you burn oil(saturn) its great cleans out the extra crap makes it nice and clean inside. But if it runs great and oil is still clean and full on your next oil change(civic), leave it alone so you don't damage your rings because it has nothing else to eat at.
also brought this up with my engines teacher a few weeks ago and he agreed with me 100%
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