"Your problem was not caused by valves out of adjustment. It was only noticed as a result of having the valves adjusted.

Going further, an engine can have its valves adjusted and before the next oil change this problem can show up. This is not an adjustment issue, but a lubrication issue."

Jon is correct on this. This is a loss of lubrication or faulty rollers (heat treatment) - improper hardening. I wonder if the DDEC records loss of oil pressure beyond a time threshhold?[/QUOTE]