Hmmm, I was hoping more people had seen these units. I have seen the Gulf Coast "TP" units as well as Amsoil's product which uses stacked discs of filter media. The wound depth filter from Oilguard seems like it would offer the most consistent filtering media of the three designs. Yes, Oilguard has setups that can drain back through the oil pan drain plug but there are other options too. I don't really see a problem with the "drain" line running uphill. Its a pressurized system, just a small inline restrictor to limit oil flow to the filter, not pressure so running the "drain" or return line uphill should be no problem at all. It would be a very simple job to drill and tap the valve cover when it is removed for the return line. Even if you decided not to run the bypass filter in the future a simple pipe plug would seal the valve cover back up nicely. RT

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