My biggest concern are the particles that still might be left in the oil even after filtering it. I've never filtered it to try using it my tank but I would imagine that there may still be acids or other impurities that would be bad for the IP. From what I understand, the IP is assembled to higher tolerances than the engine itself. I rather not risk my IP for the sake of saving a few $'s. I want my car to last as long as possible.
My used oil went to the recycler today.

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DJ


84 300D Turbodiesel 190K with 4 speed manual sold in 03/2012