15w40 M1 Delvac Truck Oil worked. It quieted them down a LOT. Still hear it however. Should I give it some time and another oil change before I go replacing lifters? They were very noisy after starting from the oil change but quieted down not long after.

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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