I remember reading on here somewhere (but I can't find it) that you could take the used oil from a change and put X amount in the fuel tank to burn at a time. What is X and is there anything else needed to be added to it? Or am I just losing my mind?[duhhh]

Check this thread:
http://www.dieseltruckresource.com/dev/showthread.php?t=116286

A search for WMO (Waste Motor Oil) bring up these threads :
http://www.dieseltruckresource.com/dev/search.php?searchid=624916

i'm running 70% filtered to 2 microns & water seperated wmo 30% dino

How are you filtering the oil?