Needs the correct diagnostics, the L322 is not OBD compliant.Had it on a computer said 36 to 37
You've a better memory than I've got cos I'm below the bottom rung really,Now I have seen this issue before but for the life of me cant remember the cause, maybe @holidaychicken, @myfirstl322 or @Saint.V8 might have a clue.
It's says if it goes there will be signs of metal fibre in the old oil and there wasn't it was clean its been plugged into diagnostics and comes back with 4th or fifth solenoid and change filter and oil