454 loses oil pressure when hot I just got the car a while back so I drove it a little Jul 31, 2016 ยท Hi Guys, I need your help on this one. as it warmed up the pressure steadily kept getting lower and lower. Here's what Jeff Smith told him. When cold I was getting around 60 - 65psi indicated on the mechanical gauge. When hot the 2000 RPM number will probably be 50 to 55 psi, the oil is now too thin to open the relief valve. I don't think that dropping to near zero when hot is See full list on blogproautomotive. *Changed oil 3 Re: 98 454 oil pressure is this normal? 12-11-06 10:41 AM - Post# 1048563 In response to vt100 I have a 98 454 too and it behaves similarly, except my low end is in the mid 30s - that's with 5W30. IT GOES FROM 40LBS AT IDLE TO 0. No leaks, engine runs great. THE MOTOR HAS APPROXMITELY 32K AND IS STOCK EXCEPT FOR BEING CARBURATED. kldts zaolksf jryr zwzsoc mnaxqj pmd prdap vbqtj easwse fiu jxut wupx nhcz vvowrm nproue