depending on how old your car is you might need some new seals and hoses, you might call up the dealerships that sell your vehicle and ask them if there are any issues with it using that fuel, older VW's had some hoses that needed to be replaced, total cost was about $30.
You can get PH test strips, find out what PH it should be and compare it to what he is making, if this guy is any good he should be testing it before and after the proses, because otherwise you are just guessing as to how much lye and methonal to add, also find out how fine of filter he filters to, and how long he lets the crud and water settle out for before passing it on to you.
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