| The best way to check the oil level on your Northstar is this:
1) Change the oil. Put on a new filter and fill it with exactly 7-1/2 (7.5) quarts. Put in that exact amount.
2) Now, go drive the car and get it FULLY warmed up. Take it up and down the highway. The oil needs RPM to get hot and expand.
3) When you get home (or go to a gas station), shut it off and wait just 2-3 minutes. The oil drains back to the pan very quickly. The reason behind checking the oil as quick as you can is to check it at full operating temperature. Oil expands as it gets hot.
4) With a KNOWN 7-1/2 quarts in the sump, scribe on the stick what your oil level is. Theoretically, it SHOULD be near the FULL mark. Sometimes, the sticks aren't quite accurate. If you scribe it with a knife or other sharp object, you'll mark YOUR dipstick so you know next time.
This is your new FULL HOT mark. If you wish, you can wait overnight and make a FULL COLD mark. They will be different. Don't fill the engine to your FULL HOT when the oil is cold because you're really overfilling it this way. If you overfill it by a quart, that quart of oil will burn off very quickly and you'll think you're using oil big-time. | 
Something ain't right!!!!Take the car to another dealership to check it out. Take what they find back to your dealership and threathen to call your Demon Spawn (Lawyer)
