We have an 03' Chevy duramax with 118,000 miles on it and has been showing low oil pressure for quite some time now. We took it into the dealership and they said that the camshaft bearings are bad and that we'll need to replace the engine! We also have an 04 GMC Duramax that we just had to do the same thing with!!! Can ANYONE please help diagnose the problem or possibly have had the same issue?!