looking to buy a 2015 duramax in a 3500 chevy silverodo with the z71 package at it s ltz .. took it for a test drive and it had loose steering and the oil preasure just starting and going down the road was at 60 lbs but, when i stopped at the lights it would drop to 40 .. not used to that i have a 5.3 gas it holds 60 all the time.. is this like the dealer says , normal ..He took it in garage and had to replace the parts to the steering box..
Lower oil pressure at idle is common in a lot of cars and normal. Do more research if you are concerned about this truck.
That sure sounds normal too me, however your 5.3 doesn't sound normal, you should also have a drop in pressure at idle, should hover around 40 ish, you may have a problem with the screen in the port just below the oil pressure sender tube, kinda acts like a check valve when it get clogged. Some rigs the pressure reads high others read low.
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