I just went to a class last week by the local Catapiller distributer.
Even though the filters are mounted such that you can fill them they
recomend that you leave them dry. They apparently do not want oil, even

brand new oil, entering the engine without passing through the filters
first. If you prefill the filters the oil in the filters goes directly
into the engine without being filtered, they consider this to be a bad
thing.


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That's pretty surprising.

I would think that running the engine for a while without oil pressure
would almost automatically do more damage than running a quart of
virgin, but unfiltered, oil through the engine. I guess the Cat guys
probably know 1000 times more about diesels than I do, though.