Weird valve train noise problem - a riddle

Funny oil analysis story. A diesel came into the shop, failed, the owner of the trucking outfit had a oil analysis done. Turns out the driver ran it out
of oil and siezed it, dumped in whatever he could get his hands on. Cause the lab called back and asked if they usually run hydralic oil in their engines................... Busted. LOL

Where do

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