Doesn't it smell great?! Keep an eye on the filters. I was changing primaries daily for about four weeks. And in that time changed the spin-on twice and pulled the tank screen and cleaned the gunk off of it. I think my tank was especially cruddy. But the bio broke loose a bunch of crud on my sending unit, and now my fuel guage works properly. The idle is definitely quieter on bio--not your imagination. Also, keep an eye on fuel lines, especially the return lines on the injectors. I just replace them as they begin to weep. All but one have given up so far. Good luck!

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1998 E300D, 287k, barely broken in.