A now retired MB Master Mechanic / Shop Manager from the dealer near me once told me that back in the 80's & early 90's he instructed all of his mechanics to put a new canister filter full of diesel purge on every diesel motor in for routine motor service i.e. valve adjustment, oil change, etc.
Called it a "Hot Shot". Says customers would rave how much better their diesels ran even after a simple oil & filter change. The secret he says was the routine hot shot.
Better yet was his thick German accent! LOL
First time I tried it, the car (603) had some 225k on the clock, and it made a big difference. Since then it gets done at fuel filter change intervals i.e. 15k or so and I really don't see any significant change. Probably cause the system stays fairly clean. But I still remember that first clean out...so I still believe
