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You need to get under the hood and listen with a screw driver or wood dowel rod pressed up against the block or suspisious components like water pump, Injection pump.......heck it could be a hole in the header, exhaust pipe or muffler. Switching to Rotella 5W40.....(a thicker oil with more mass) should have deadened any internal engine noise..not caused it.
Let us know what you find.
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 FRED
Daily Driver: 98 E300TD 199K
Hobby Car: 69 Austin Mini
Past Diesels: 84 300SD, 312K
87 300SDL, 251K
94 Chev. K-1500 6.5Ltr.TD, 373K
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