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Not sure if this is the place to ask this? I use Diesel Kleen not sure how much to use per fill up . I normally put in 28 to 30 gallons. thanks for any help.
Half a qt per 29 gallons is what I use. You cannot put to much in, but after the 6 pt cetane level boost is achieved, you will just be adding more lubricity agent to the fuel, which is great for 6.0l injectors.
I keep a small OJ bottle in my tool box that I marked measurements (gallons) on with a permanant marker. I figured up how much was needed by dividing it out per the recommended for 100 gallons as indicated on the bottle, and used a measuring cup in the house and marked the lines. The small kids size OJ bottle (approx. 6 oz.) is perfect because it will fit in the filler hole just right with no spillage. I think I can put approx. 20 gallons in per bottle full. (Depends on what size bottle you use)