I just changed the oil and filter on my 97 zx6r. The oil level is a little over half way between the lines on filler window. My oil light stays on, on my dash. It was on when i rode the bike last time and i thought it was because it needed changed. the oil was really black. so now that i have changed the oil, the light still stays on. (i had i running for about 20 minutes.) Is there something else that could be causing this to stay lit? Could there be too much oil in it and that's why? Or is this something that i shouldn't be concerned about? Please help!?!