Frank gave you all the reasons for low oil pressure when hot except one. The
rockers. This is easy to check, remove the valve cover when the engine is
warm. Start the engine and if you have a little leakage you can wipe up
with a rag while the engine is running it is fine. If it looks like a lawn
sprinkler with oil going all over the engine compartment, you have found
your problem. You can get an over size shaft, or replace the whole unit.
Check this first, then the oil pressure relief valve, if these don't fix it
you have bad bearings.
Crash
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