I agree that for some people with a properly installed heated system and who live in a warmer climate the benefits can be pretty big, but for people with short drives to work and who are in cold climates, (like me, and I drive 3.3 miles to work one way) WVO doesn't really work very well. It would be useful for me when I drive to the middle of the state a few times a week, but I have no good source of oil around here, and don't really have time to go collecting it or filter it. I barely have enough time to do normal work on the car as it is. 
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