first off i have an 03 gmc 4.8 with intake, flowmaster, and superchips. just rolled over 110,000 the other day.
yesterday my friend was following me home and he said that when i floored it, there was a stream of grey/black smoke until i let off. i have heard of the these motors smoking but the ones i have seen have closer to 200,000 miles on them. i figure it is just blowby from a high milage engine, but was curious to know if any of ya'll have had this happen.