I have read the 07 owners manual and the procedure for resetting the oil change and filter change mileage. It is pretty useless on what actual needs changing. There are 2 places to put numbers: i.e. 3750/3750. What is the meaning of the first versus the second numbers. If I changed my oil/filter at 4000 miles and want to remind myself to do it at 8000, what do I put in? 4000/8000 or? Thanks