I've been running WMO for (I think) 4 years. The only lesson I've learned about, is the value in pre-filtering the oil. If you want to, you can simply dump the oil out of your oil change drain pan right into the fuel tank. It won't hurt the engine but it will hurt your wallet as this will quickly clog the fuel filter and they aren't cheap! The idea is to filter the used motor oil with a cheap filter that results in a fuel that will not prematurely clog the expensive diesel fuel filter on your engine. I accomplish this with (cheap) #4 coffee filters paper clipped to a funnel. Mix the wmo 50-50 with diesel fuel or home heating oil or K1 and gravity feed in through the filter into a clean jug. This will result in a fuel that works pretty good at most temperatures (after the engine warms). I only run this mixture after the engine warms, start-up and shut down is with regular diesel. During the summer, this may not be necessary? The wmo fuel mixture runs quieter than diesel and drops my fuel mileage from 20 mpg to 16 or 17 and has slightly less power. If you're not towing heavy nor climbing big mountains you may not notice the power difference