I have noticed that when I put in the volume of oil identified as capacity in the owner's manual of my 3 GM cars (97 Lumina, 98 Tahoe, 03 Cavalier), they are over the full mark on the stick by 1/4 to 1/3 quart (estimated). We picked up the 03 Cavalier with 4 miles on it, and it was over the full mark from the factory. In my 2000 Honda Civic, though, the capacity puts the level exactly at the full mark on the stick. So I am wondering why this is? Poor attention to detail? manufacturing tolerances? a trick to make new car buyers think they are using less oil than they actually are? Anyone else notice this? Do you guys fill to the stated capacity or to the full mark on the stick?