My dodge ram 1500 oil gauge droped to 0 i did hear some rattiling noice, were do i start?

my dodge ram 1500 oil gauge droped to 0 i did hear some rattiling noice, were do i start.
i have oil. it goes to 30 then drops to 0 . it is also overheating when this problem started

Answers:
You either have an oil pump that is going out, or the bearings on the crankshaft are worn so severely that they can not push the oil to the top of the engine. Have it looked at by a professional as soon as possible, you may be able to save the engine, but if you keep driving, it will be destroyed.
take it to the garage
sounds bad brother - sounds like your engine is blown or is about to.
Sounds like your oil pump is going out.
DO NOT START IT! Remove the oil pan, and look for little bits of metal. If you find any, look for money to pay for a new crankshaft bearing job.
dont know anything about your particular car, but no oil pressure, rattling noises and overheating = engine rebuild.
same thing hapened to my ford probe..was a lot of junk in the oil n the pump was getting clogged.hence oil pressure for a few secs untill it gets clogged wi junk. try takin sump off n givin it a gd clean out also check oil pump n flush the engine.but if ur engines already making a knockin noise ur big end bearings may be damaged n its prob btr gettin a new engine or scrappin it

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