I recently changed the oil on our 02 Toyota Avalon and filled it with 5 qts of Castrol Edge. However, I have noticed that when I check the dipstick (which, by the way the oil level never drops), the oil level is about 0.25 of an inch above the full mark. The car has the 1mz-fe v-6 that the owner's manual states holds 5 qts. Does this seem like a dipstick error?