OK, the temp today was like 75 degrees. When I was leaving school i start my car and when i start it i give it a little gas. some black smoke comes out of my exhaust. i stop the car and go look at the exhaust, there is black sut all in the tips. One of my friends is also a mechanic so he looks at it with me. We put the car in neutral and rev the engine a little, as we do this a little less smoke comes out. we periodicall rev it to about 5,000 RPM's every 30-40 seconds and every time the is a little less smoke. I told him that the rings might have burned out but there are only 7000 miles on my car. Does anybody have any other thoughts, or does anybody know about how much it would cost to get a compression test done to see if i have a gap between my cylinder wall and piston. Please Respond.