Motor oil will not hurt your gun.
Then there is this:
conventional motor oil will be fine if you keep your rifle under 5500 rpm:D
Bro, you need to read. Some questions are hard to find answers for. Basic firearm maintenance? Come on, dude. I understand not knowing the answers, we’ve all been there but there are stickies about this. Go read 'em.
This train wreck never stood a chance