I have free oil changes for life at the dealership and get their "full" synthetic change there, Im actually due for one this week. I only change every 5k anything less is over kill as Matt said. I only change my 240sx syn oil every 2-3k cause I was constantly at high rpms, rev limiter and side ways!! As far as oil filters, OEM is also what I stick to, my sister had my Jetta for 6 mths, changed it a gas station where they put some cheap filter on.. well it leaked so much it seeped inside the tranny and ruined my brand new Sachs clutch pack. OEM filters only for me