2006 Chevy Trailblazer L4.2 3, 4WD. When cold start oil pressure 45 @600 RPM. After running (hot) oil pressure drops to 0, increase idle to aprox 1,000 RPM oil pressure returns to normal??
first thing to try is to change the oil and filter..go up in weight 5- 10.... also weak /bad gauge or sending unit...after that the bearings......
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