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Oil Pressure high on 2005 Chevrolet Avalanche 1500

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
My oil pressure is running higher than before (40-45)and it fluxuates as the vehicle speed does. Oil Sensor or Oil Pump?
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(2) Comments
How many miles on engine? What kind of oil do you use? Allot of times the oil pressure will fluxuate 10-15lbs.