WTF?!?
Is that Red LocTite right below that flange of the cap? What did the previous owner do to piss off the lube tech that changed the oil.
Oh wait... that's a second O-ring... Carry on...
Oh man!!! For me I would load an older game save and grind as much EXP Pts and farm as much money to upgrade all my weapons before I try a re-gear on my own.
Good Luck