i just got my 02 LS about a month ago an a couple days after i got it i noticed that the oil was only reaching the bottom hole in the dip stick, since then it hasn't used any oil. Then about a week ago it was time for an oil change so i put in the recomended 6 quarts, pennzoil platinum synthetic 5w20,and its only eaching the bottom hole in the dip stick. Do ya'll think since its a used car someone could have replaced the dipstick with the wrong one at somepoint or another or could it be a bigger problem?