2001 Chevy Blazer oil pressure gauge

2001 CHEVROLET BLAZER
72,380 MILES • 6 CYL • 4WD • AUTOMATIC
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SHAMMY528
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my oil pressure gauge on the dashboard fluctuates when driving. averaging 40 but at some points going as high as 80 and dropping as low as 20. yesterday morning i could not get the car to start but last night it started but the gauge kept rising and dropping while the car was being driven. when idiling it dropped to 20.
what can cause this and is it a problem?
Nov 29, 2009 at 8:56 AM
Repair Safety Notice: This information is for general instructional purposes only. Vehicle repair can be dangerous. Verify all information, follow manufacturer service procedures, use proper tools and safety equipment, and consult a qualified repair shop when needed.
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