I get a huge drop in oil pressure in my car (98 trans am,ls1).When I start the car in the morning I see almost 60 psi of oil pressure after about 30-40 min of driving I am lucky to see 20-22 psi of oil pressure.Now that reading is at a idle when my foots in the gas I see normal oil presure(between 30-40 at a cruise).The motor has a 110,000 miles on it and I run 15-40 royal purple oil.

Any Ideas