"Dieseltx carries a "LIFETIME" warranty against manufacturing defects
and workmanship, does not cover improper installation or it's results. "

If Dieseltx really believe it worked, they would provide some kind of
minimum results. It reminds me of all snake oils and their "customer
testimonials".

But if it doesn't actually DO anything then there's nothing to break, is
there? Talk about a perfect scam.

They're bogus, completely. But PT Barnum was right and folks like that
prove him right every day.