Hey guys, I'm new here so I had a question. Just this week, I decided to do my own oil change on my 2006 Trailblazer. I haven't done my own oil changes for years but, I decided, that since I have 115,000 on 'er to make the switch to full synthetic. So, I picked up 7 quarts (that's what it says the 4.2 needed) of Mobil 1 Full Synthetic 5w30. Put 'er up on the ramps, drained the pan and removed the filter. Put the plug back in after quite a while, put the new Extended Life Fram filter on, and then filler 'er up with 7 quarts. But, the question I have is this. When I put the old oil into the 5 quart Mobil 1 can to take it for recycling, it didn't even fill it up. And, when I check the dipstick, it barely shows as being on the tip of the stick even though I put 7 new quarts in.....what the?????