oil

Hello, got my first bike a while ago and now it is time for a oil change. The manual suggests 10w40/10w50, i have 4L of 15w50 since the last owner said he had used that one. Is it safe to use it or should i buy another type of oil? Thank you in advance. Anton

I have an 09 scrambler and it is leaking oil from the stator casing. It is not actually from the casing but following a wire coming out of it. The gasket around casing was intact, and the rubber boot that fits in the casing is tight and good. The oil appears to be coming through where the...