hi, sorry for the newbie questions but I like to be informed in advance. so, if I end up with a copen it will probably be the smaller engined one. how often exactly does the oil and oil filter need changing? i'm pretty sure that i read 3000 miles somewhere but when i mentioned that in passing to my brother he almost spat his tea out as if i'd told some kind of joke. plus, what would be the typical cost of getting that done by pro? and then , a general service - how often does it like those? - and again, a typical cost? if this all sounds like stuff i should know, in my defence i should point out i'm a late starter to the world of driving and it's all greek to me. thanks!