Also should I check the intake crossover. I don't imagine that has anything to do but should I see oil in there. Also will radial anx axial play tell me anything

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Only diesels in this driveway.
2005 E320 CDI 243k Black/Black
2008 Chevy 3500HD Duramax 340k
2004 Chevy 2500HD Duramax 220k