Zippy i have the same problem when my Vortec is cold the pressure drops until
I am warmed up @ 200 on the temp gauge, then the lol is fine.. so my first attack is the oil sender unit and here goes something I donít see people say they
Do when changing the oil pressure switch is the filter underneath the oil switch,
Itís a real a %^&* to get to but when you see how thin the screen is on this small filter you can see why maybe the oil is dropping, but if i had time iíd Put a pressure gauge in 2 areas to see. If the pressure is really dropping. Some type tap some place near the oil pump or down the line before it gets to the top of the block. Well Iíve been real busy working hard but one side wants to jump in
And do it the other side is saying hell no, no matter how those guys make to that job is, when i stand in front my truck is does not look like that, i wonder how the dealer suckers do it.. no disrespect to the good dealer machanicís..
But i am going to do the job soon..