When i run interstate or pull big load and come to a stop my oil pressure goes to 0 but it shoots back up after i get off idle. What could this be? Thanks. It only does it when its warmed up.

 

my 96 does it to, maybe it is bad oil pressure sensor

 

Mine also does it. Gets worse when it's hot outside. I figured it just might be that when it's hot out, the Amsoil I'm running in it is getting too thin for my oil pump to pick up?

 

I'd put a good mechanical gauge on it, at least for a one-time check just to confirm what's going on.

The probably clean the contacts on the sensor or replace the sensor.

 

sensor or gauge is your problem i dont think it is major!

 

My 98 did the same thing. It was the oil sending unit. Cost about $100 at oriley auto parts.

 

Get it from Cummins, the parts store senders dont last very long.

 

or it could be low on oil, dont laugh i did it when i was younger, i was driving home from up north one night and when i stopped the oil pressure went to 0, it was only 2gals low, now i check my oil all the time

 

That sucks. I was thinking that, so I checked it out already.

 

Its the oil pressure sender as already stated.
Buy it from Cummins as Doc said or you will do it again.
ITs a PIA to do as its behind the P7100 and not directly accessible and you need to plan on bending like Gumby to get the job done.