I don't understand why some engines burn oil and others don't. I heard LS1'* burn oil from the get go. My 2000 GTP with 100,000 miles on it didn't burn enough to even notice on the dip stick. My Bonnie doens't burn any either. That'* the way it should be in my opinion.

1 qt every 6k miles? Nothing to worry about! If I were in a climate like Florida I would run 10w-40. If you switch I'll bet your consumption gets cut in half.

we use 10w40 on both our cars and have no noticable oil consumption.

I heard a rumor years ago that GM said they'd void the warranty if they found evidence of 10W-40 in the engine. Again, just a rumor (or rumour).

I usually add 1/2 to 3/4 of a quart between oil change intervals of 4000 to 4500 miles on average. Castrol 10/30- I also drive the car hard with my lead foot. There aint no lettin up when I get the pedal to the medal with this L36, it get'* a beatin.

how would they know that?

Our 97 has had no oil related engine problems for the 130k miles we have owned it and ran it with 10w40.