I have had a 2001 Dodge 3500 Cummins for about 5 years. The manual calls for 11 qts of oil at an oil change, but the oil is right at or above the full line on the dipstick after adding 10 qts (with the oil filter full) and it is right at full each time I check the oil. Recently, an acquaintance of mine said "Put in the 11 qts and remark the dipstick - you have been running a qt low." What is right - the manual specifying 11 qts - or the marking on the dipstick?