Q: how to change oil pump on 2000 Chevrolet Silverado 1500

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
when you first start up truck it has about 40 yo 45 lbs. of oil pressure but go about 15 to 20 miles then the pressure drops to about 15 to 20 lbs. stop for a while and it goes up to about 35 lbs.
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