Low oil pressure at start

Asked by Jun 07, 2016 at 04:54 AM about the 2000 Chevrolet Silverado 1500 LS Ext Cab Short Bed 2WD

Question type: Maintenance & Repair

Live in California have 320,000 miles on truck am
getting 20 lbs at cold start looking for a reason.

2 Answers

15,285

320,000 miles of wear all tolerances have enlarged, in addtion the oil pump has worn that's why only 20Lbs of PSI.

1 people found this helpful.
116,335

Does it stay at 20 lbs or does it drop as it warms up? If it drops the engine has excessive clearances in the bearings, if it doesn't drop then the possible cause would be a stuck oil pump bypass valve, it is stuck in the bypass position. HTH

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