I did my very first oil and -filter change today. Everything went fine I believe (although I almost left the gasket from the old filter in there...). I filled up new oil (mineral 15w-50), ran the engine for a minute, and topped up almost to the max level. Then I went for a little ride, and when I checked the level again it appeard to be somewhat above the max level... I also noticed the engine struggled a bit at idle, and it didnt use to do that.
So, should I be worried? Can too much oil cause the idling struggle, or perhaps I put in thicker oil (don't know what was there before)?