I've been doing my changes every 3-3.5k miles. My driving only slightly spirited and the oil seems to come out too dirty. Mind you the engine has only has 32k on it. I had the change done at a shop last time (its too bloody cold out!!!) and the tech showed me the old oil and again, darker than I would expect. He was telling me to flush the engine, I politely declined.
I seem to have read here that some CSVTs tend to dirty up oil quickly????
