i have an 85 t/a was sitting for 2 yrs and the oil pressure at idle is about 25-27 lbs normally ive seen them in the 30's at a cruise it has oil psi of about 45
the oil is 2 years old 5w30 i know it needs to be changed

but is this acceptable oil psi readings? it just turned 100k
no blue puffs and no leaks

 

That doesn't seem bad. my 87 LB9 get 30 at idle about 50 at cruise after it warms up. I don't know the mileage speedos way off. One of my squawks. but what do you want, I only have 350.00 in the poor beat Z28.

 

That's decent pressure at idle. Changing your oil and filter it may perk it up a little. Once the filter gets too clogged, oil will flow through the filter bypass, causing unfiltered oil to circulate through the system.