Don't know what kind of warranty your engine has (5 years? 7? 10?). Dealer will probably try to screw you and say you mistreated the engine - esp. if its got to be rebuilt/replaced. Based on what you stated, your oil pump is shattered. Sometimes, faulty metals get into the making of components - so it's possible that is the culprit. Hemi engines are typically pretty good engines as long as you're not trying to be a speed demon, and as long as you take care of them. If it's JUST the oil pump, then you might be lucky and able to get away without having to replace the engine, but IF pieces of it got into the main part of the engine, or if a piston failed, the entire engine is going to have to be rebuilt or replaced. If your warranty is good (7 years/70,000 or 10 years/100,000) you might be ok - but again, dealer may try to screw you.