First I'm new here nice to join & hopefully yall can help me. So

car has been garaged for total 13 years I got it running three years ago (2016) needed fuel pump lucky it was a used one on car already so I swapped it out car started up no problem ran it for maybe two weeks before being garaged again for another three years to now (2019) so go get car out of step mom's garage who owned it and was giving it to me for a second time 😂 ( got doing something I shouldn't) car doesn't start just like first time put gas in it nothing check fuel pump again test I test both on battery old pump worked so I swapped them back around car started up but oil was everywhere i don't know why or where from when car was fine and healthy no leaks of oil in garage or anything I'm so confused hopefully it was just drain plug vibrated out but haven't checked yet. What could have caused this

 

Get under the car and take a look, oil cooler lines a good start.

 

Will do found another thread that said that or check crank bolt I think so I'm check those two things tomorrow cause engine is completely empty on oil