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Thank you all for the info. I don't believe the engine has any issues, it has 436 hours on it and runs fine, no smoking under heavy load so I don't think it's a glazing problem. I think it's an owner problem, I'm not used to how diesels interact with oil. I'm obviously on the wrong track with changing oil more frequently and how that might keep it cleaner. Sorry for the confusion resulting from lack of location info. The lower price of the Baldwin filter is only part of its attraction, I think it is possibly a better filter than the OEM part.
My main question though was about bypass pressure. I think I understand the function of the bypass valve, if there is a clog or high resistance in the filter then the oil gets bypassed back into the engine without going through the filter element. So what's better, a higher bypass pressure which I assume would force oil through a more clogged filter but probably would lower the pressure the engine sees downstream of the filter, or a lower bypass pressure which would keep the pressure up but send unfiltered oil through the engine. Or am I not understanding what the bypass valve is for?
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