I have a 1990 K2500 & I found this forum while searching for cooler lines. A while back I removed the oil cooler lines & immediately the oil pressure increased a bunch. I put Melling MFA 350 adapter on it for installing the oil filter. The pressure will peg the gage when cold & drop to about 45 when it warms up. Is there any way to lower the oil pressure? I am running 10W30 Mobil One. The engine has about 100,000 miles on it.