Serviced my 370Z this week. The oil filter is really small, probably about one sixth the volume of a 240Z filter (yes they are exceptionally big). Same as Micra apparently. Also the 370Z Filter is changed every 9000 mls, the 240Z every 3000 mls. So why is this folks - engine bay space? Any advantage in having a big filter - surface area of filtering material perhaps? Do modern engines and oils need less filtering?