Just changed the oil and filter in the 16V for the first time. I reckon nearly 5 litres came out and when I put 4 litres back in, which is what the 16V hand book says and all my other Sprints and 33's have had, it is well below the mark on the dip stick. Any suggestions? Does the 16V have a bigger sump and can the hand book be wrong. And why is the dip stick wrong?