Much cheaper and simpler. From what I understand the problem is finding a place on the engine where you can make a big enough hole so the oil from the centrifuge will drain fast enough. Maybe a hole in the side of the pan, which isn't so simple. The air pump allows you to use the small...
I don't think the ones on trucks are any different. They run at a lower oil pressure so they're less effective, but being a bypass filter they are continually processing engine oil over time and don't have to get it clean in one pass.
I know this is a 5 year old thread but it's an interesting topic. About the air pump on the Dieselcraft kit, it's purpose is to assist the oil drain back to the crankcase. Not sure how the pump works exactly, I think it may put the drain under a few psi of positive pressure. The Dieselcraft...
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