chillman88, my order of operations is: -let acquired WMO settle out. The longer, the better. -boil out the water -heat it while running thru the centrifuge. I usually heat it between 80C and 110C (176F - 230F) -after it's centrifuged, I mix it with 10-15% RUG and maybe another 5% biodiesel. I don't even mix it with diesel now. It seems to run ok in both my IDIs and Powerstrokes. I do get the engines up to operating temperature on diesel before switching to the WMO cocktail. The engine also gets run on diesel before shutdown to purge the WMO. I also run Seafoam in the diesel tank to help de-coke the injectors.