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Keeping Oil Pressure Up in a Chevy Truck
My daughter has a '98 Chevy 4x4 truck with 127,000 miles on it. After the oil gets hot, the oil pressure drops to around 20 lbs. She runs 5W-30. Short of rebuilding the engine, would it help to run higher viscosity oil so it doesn't break down as easy to help keep the pressure up?
-- Mike Wilson, Petersburg, IN
It is not unusual for a higher mileage vehicle to run at lower oil pressure and this alone should not be of any concern. This is primarily due to larger clearances due to normal wear and tear. We recommend you switch to a Mobil 1, which will better maintain its viscosity over the life of the oil drain. Specifically, switch to the higher viscosity Mobil 1 0W-40, which will provide excellent high temperature protection (SAE 40) after warm-up and outstanding low temperature start–up (0W) for those cold Indiana mornings.