I have had this problem for a while now and have noticed that after I get an oil change my oil pressure is at 35 at start up and drops down to 15 when its warmed up and idling. When im going 40mph and more the oil pressure stays at 35. When i first got the car the oil pressure would go all the way up to 60 on the start up. Also after a month or 2 after an oil change during idle and when the cars temp is a 220 the oil pressure will drop in the red unless i give it just a little bit of gas to raise the idle. There is enough oil too when this happens, so any ideas on what could cause that?

 

- Bad oil pressure sender (probably the #1 cause)

- Worn oil pump (or a problem with the relief valve spring in the pump)

- Worn bearings.

 

my original oil pres. sender did that, my napa oil pres sender did that and stuck at 80+(yea right) and my new one seems ok now, it will drop when the car is warm, the oil thins out, you'll get 50ish on cold start and then drop to 20-30 at idle and 40-50 while driving, those senders arent that accuratate though, get one from the dealer, its much better and reliable than napa or advanced or any of those places