yes, if he didnt tighten it down, it can easily work its way out from vibration. if he saw oil pooring out, its a good chance it happened shortly before he noticed it. which is good.
get a new bolt, and make sure you tighten it too spec. some people have even rigged up ways to lock it with safety wire or other methods...
get a new bolt, and make sure you tighten it too spec. some people have even rigged up ways to lock it with safety wire or other methods...