another 360/408 over heating

First, sorry if I came across as snarky. Not my intention. Sometimes I type faster than I think and the tone gets demented.

You stated you have contamination from compression. If your pressure is bleeding off or bleeding over. You have a problem to solve. You test while at full cold and at hot. No motor running. Put pressure to the system and let her sit to see if she bleeds off. Half the time you'll hear where from and bingo. Bob's your uncle.

Please trust me on this. This will give you more information than you realize and a good piece of mind in the end even if the system is a ok.