i DIY my oil change between the free dealer change. changed once already and i'm at 15,500 kms on the odometer. the first time i changed oil i cut open the oil filter and found tiny thin metal shavings but i guess that's normal from a new engine. i'm somewhat uncomfortable with changing oil once very 20,000+ kms. i used castrol syntec 5w30 and it costs me about $60 per change including a new filter from dealer i guess its fine. what are your views about this?