To be honest I havent really gotten into the engine bay. I basically wanted a car to get me to point a to point B with out dumping money in it to customizing. BMW's are nice but they are EXTREMLY high maintainence. Lexus is a lot less maintence and cheaper in the long run. I havent looked at how hard it is to change the oil but I cant imagine it is very hard at all. Like I said though, if you get a IS300 that is still under warrenty, you will have to take it to the dealership to get the service or else your warrenty is void.