I have a 2001 dodge ram 1500 with the 5.9L v8 I have owned it for 7 years I have always had 65-70 oil pressure in the last few months when it is first started its fine but once it warms up it drops to about 30-35 when idling if I keep it up over 2k rpms it returns to normal but once rpms drop the pressure goes back down to 30-35 I have read all over these forms that this is normal but my truck has not done this for almost 7 years even after brand new oil and filter still the same I have pulled my plugs and I'm not burning oil.

 

Burning oil, and oil pressure, are unrelated.

Plug a mechanical gauge into it, and see what pressure is really doing. Take it from there.

in all reality, your oil pressure is pretty much right where it should be.

 

I have read on these forms saying they were related, which is why I stated that I will have to get a gauge but if this is what its supposed to do why has it only done it recently like I said I've owned this truck for about 7 years and the oil never went below 60

 

typically mine is higher when cold but when warmed up itll sit on the first line at idle and go up from there during acceleration obviously

 

The only real relation between low pressure, and burning oil, is when he oil level gets to low because you are burning it, you start losing pressure. Oil gets into the cylinders past the rings, or down the valve guides, neither of those areas are under pressure. (for the oil, at least)

Dodge says minimum pressure at idle, on a warm engine, is 7 PSI...... pressure should go up about 10PSI, per 1000 RPM from there. (up to a point.... I think it actually maxes out around 70-80 on the stock pump.) As the engine ages, oil pressure will slowly decline, to a point, and then pretty much stay there, so long as you keep up the maintenance. If you are running 60 PSI at idle...... you are wasting a low of power, and generating a lot of heat in the oil, to no real good purpose.

So, did yours slowly fall off? Or, did it just change it's behavior one day, out of the blue? Did you have any other work done to the truck around the time you noticed this? Changed weight of oil you are using?

 

Get a rental gauge from autozone and check what is really happening like Heyyou said. Probly your oil pressure sender is tired and and needs replaced. Mine did same thing pressure wouldn't change much with rpm anymore, swapped it out and read accurately now.