I have a 1999 Dodge Cummins. When I started it up today the oil pressure was reading a little over 40 and when I started driving it was on the max line for PSI. After the engine warms up completely the pressure will return to normal. It usually runs a little under 40 at idle and a little over 40 while I'm driving. Has anyone else had a problem like this or know what could be going wrong.

 

Moving to the correct section. Please read the section descriptions so you post in the proper area.

 

Thanks man which section should I put this under next time

 

This one. Diesel specific. This gets you in the section with the experts. Welcome to DF.

 

Thanks man haha first time using this website

 

No worries. It's laid out pretty straight forward. Just read what each section is about. Look around. Lots of good info and good people here willing and wanting to help. Also check out the 2nd gen Ram section that's probably the most active section here. You can also post questions there about your truck.

 

Try a direct reading gauge.

 

do you know what could be causing this problem

 

Could simply be a bad sending unit. Direct reading gauge will let you know if its more serious.