BG 44K is an excellent product when used for an induction cleaning but I think anything dumped in the tank is pretty worthless. I still do it though.

As for diesel purge, my opinion is that 9 times out of 10 it's not needed, it all depends on what the issue may be and what substance may have somehow made it to an injector. If it solves the problem, $9 is a lot cheaper than a set of injectors if the problem just comes back it's not like nine bucks is that big of a deal. Bottom line I think the need for that product is the exception and not the rule.

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'83 240D