Purchased a CPO G35 with 42K miles. Had dealer drain and fill transmission fluid at 46K miles (5qt). Scheduled maintenance is to change transmission fluid at 30K intervals. Do you reccomend drain and fill again or total flush and fill? Have not had any transmission problems. Maintenace history does not show if the fluid was ever replaced by the original owner (assume it was not). My concern is that flush and fill will stir up particles and may cause problems. Either way this work will be done by the dealer. Please advise. Thank you.