i paek the truck for the winter. this year i notice the oil pressure after bieng warmed up on the hiway runs at about 65#. i have a one ton as well, its oil pressure is like 20# less. should i be concerned? to me it seems a little high

 

The first thing to do is to check it using a known good mechanical gauge at the tap on top of the oil filter housing.

High oil pressure can be caused by thick viscous oil in cold temperatures, defective or restricted oil filter, a stuck regulator spring or even a spun bearing, anything that restricts the flow of the oil.

But first check and make sure the gauge is accurate.

 

yes i am going to put a gage on there tomorrow. however the one am using is a very good aftermarket one. am using 15/40 that is in summer warmed up. just seems hi as i remebered it from last summer.

 

Mine is 30 at idle towing. 40 not . 60 to 65 as soon as I start hitting the throttle. never peaks over 70 wot

 

so are those readings with the stock oil pump? mine has not been changed which me very syspicious.

 

Anything above 9# at idle is considered good by the book. Anything over 30 when at speed is considered good.
Most when tight run 20 - 30 at idle, and is held around 60 or so at speed by the relief valve. Not unusual to see 80 or more when the oil is real cold.

The main thing about oil pressure is that it will have a "normal" pattern, and if it changes, you know something changed, ie something's wearing out, or the oil is getting diluted with fuel, etc. It's an early warning system.