ok. i started driving my old 6.2 about 3 years ago. at that time it smoked just a little when it was cold. over the years it finnaly got to where it smoked nasty black/blue oil burning smoke that left soot everywhere and burned my eyes. so when i got my new motor and it was still in the donor truck it did not smoke at all. not even on cold starts. its been about 2000 miles now and she smokes a little when cold. then last night i noticed that ideling in a parking lot, at running temp, was smoking just a little. i got down on my knees and gave it a sniff and it was the same burning oil smell. what the hell am i doing wrong? did i mess up this motor too? please give mer some help. i am using chevron delo 400 oil. it has new oil and fuel filters.