issue Whistle sound, Oil pressure

[Alex A Madrigal]

Hey Everyone. I recently purchase a 2014 Chevrolet Silverado Double Cab 5.3 V8 4wd. One owner, almost 30k miles on it. When im cruising my Oil Pressure is around 40 PSI. when i stop or press the breaks my oil pressure drops to around (25-35) PSI. When i turn my truck on the mornings. its around 40 PSI but then it drops to (25-35). is this normal. i check the oil and it seems fine. i dont here any noises on the motor. Any help would be appreciated or feedback.

[MOhunter92]

My truck literally whistled at a certain rpm, it was most noticeable with my sliding back window open. I knew it was exhaust, and sure enough it was. There is a flapper valve near the muffler that wasn't fully opening/closing and it is a known issue with these trucks, so it whistled pretty loudly. Had my whole exhaust replaced and it now is gone. Now it is a loud hiss, or rush of air kind of sound but at least it's not an annoying whistle. It was reminiscent of a turbo

 

 

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