Join Date: Jun 2011
Location: Tinley Park, IL
Your car is going to use a certain amount of oil during "normal operations". That oil is used to lube the cylinder walls (as well as everything else) and as the piston moves up and down, small amounts of oil may get past the ring and burned off. Not enough to cause smoke out of the exhaust, but over the course of 3000 miles, you may see half a quart loss. There can also be oil "blow by" in the PCV system, I had an oil catch can on my GTO and it caught a fair bit of oil from the vacuum. Hell, GM said that an entire quart loss of oil was "normal" on my GTO every 3000 miles.... So if you're only a half quart low at an oil change, I wouldn't worry. If its a quart of more, you might have a bad piston ring or a leak that isn't enough to make the drip to the ground.
Left a 421RWHP 2004 GTO, but honestly loving the G6 GT coupe!
87' white Firebird(sold)
01' green Grand Am SE2(traded for the 03')
03' orange Grand Am SC/T(totaled)
04' blue GTO(traded for the G6)
00' tan Montana(I swear, its the wife's)
06' black G6 GT Coupe