Originally Posted by dwaynerz
I add power service additive at every fill. In winter, I use the white bottle. 8 oz per 25 gal.
I use the gray bottle(Power Services Diesel Kleen) in all weather above freezing and the white bottle when times are near freezing. One oz. per 3 gallons. Here is the best measuring device I have found. Yep, it is what it looks like. Very clean, cheap(3 for $2 at Walmart) and doesn't leak. I know my Ford had 37 gallon tank. At half a tank, which would be 18 gallons, I add 6 oz to the tank and refill. Very easy to do.
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