That had some small debris to go thru & scratched it, no big deal, were at an issue it would quickly have got eaten up look like rough concrete or worse,- 99% of that is still smooth, just drive it there are thousands of engines on the road with similar places,- that is what oil is for to lube & carry away debris & most of it is there stuck in the muck when engines are torn down & rebuilt, your nowhere near that from a scratch, Byproducts of combustion are carbon & like coal these particles darken oil with time/miles turns opaque with these sharp particles seen under a microscope that cause engine wear.