Let me start by saying that I am an Archoil fan, so I might be a little biased. I used the AR6400-D in my mini excavator that has a Kubota diesel. I bought the machine used and was told that the fuel system had been completely cleaned out. It was difficult to start so I used all of the 16oz in 5 gal of diesel (tank was practically empty). I started it and let it, letting it run for about 15 minutes with 3/4 throttle and shut it off. The next day,it started easier and in a week's time it has made significant improvement. I haven't run the 5gal completely through it, but it starts better every time.
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