Absolutely not. I did this myself shortly before my SDL got totalled. My car had somewhat low compression and used oil due to slick cylinder walls (no telling how many miles were on that engine). While the smoke stopped and the engine quieted down while on the "veggie cleanse", as soon as it worked that crap out of the fuel system and ran on diesel again, it was "business as usual". No difference. No "magic in a can" will ever fix your car. Seriously don't waste your time. Sometimes Kent has good suggestions or information, this is a good example where he doesn't.

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Current stable:
1995 E320 157K (Nancy)
1983 500SL 125K (SLoL)

Gone but not forgotten:
1986 300SDL (RIP)
1991 350SD
1991 560SEL
1990 560SEL
1986 500SEL Euro (Rusted to nothing at 47K!)

Gone and wanting to forget:
1985 524TD 167K (TotalDumpster™) [Definitely NOT a Benz]