1998 ls1 low oil pressure
 

This had been bugging me. ill just explain whats going on. when i start up the car when its cold the pressure is a hair below 40psi. when its hot and driving around 45mph its at 35psi.. I was using castrol 5w-30 oil so then i changed it to castrol 10w-30 today and it's doing the same thing. I thought the thicker oil would help with the oil pressure. My dad keeps telling me its fine. he has a 99 trans am. But it never used to be like this.

I have a 99 TA as well, the factory guage is horrible. Mine does the same thing well kinda... start up to normal op temps a hair below 40psi cruising is a about 35 to 38 , WOT 50 to 60 ... for what I've seen this is pretty normal atleast on the factory guages

oil pressure always drops some once engine is warm, normal.

its normal. dont worry about it, its time to worry about it if it drops below 25.

agreed, sounds normal

well then. guess I dont have to worry. thanks (: