I think that's the next step is to check compression and timing. I'm worried that it's going to be low. Turbo seems very healthy. Not a lot of play and spools right up.

I'm also not sure where I'd get a compression tester that would work on this car.

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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