My '88 L98 has been showing low oil pressure on the gauge when the car is warmed up. The pressure rises with increased rpms - but drops way down at idle or coming to a stop. Has no problem holding pressure after a cold start. What could be causing this? I never noticed the car doing this before and seems to drive the same as ever.

 

I wouldn't trust the electronic oil guage. Mine does the same thing. At idle the oil pressure is suposed to read around 30 psi and while driving up to 60 psi. I would hook up a manual oil pressure guage just to make sure your electronic oil guage is reading correctly

 

thanks