I use Diesel Purge and did not notice any difference other than the nailing went away. Smooth as silk now, but I think it is good that most do NOT see any difference, if they are maintaining fuel systems the way they should. If you see an improvement, it is probably because of neglect - not to be confrontational in any way. I have also used Stanadyne in Navistar 7.3 diesels. Either one works great. My local NAPA sells Liquid Moly products. I buy Diesel Purge for $5 a bottle.

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Thanks,
Mark in NC

"Spark plugs?...We don't need no stinking spark plugs!"
1985 300SD "Der Silberne Schlitten" 420,000 mi


Wish these were diesel:
2003 Ford Club Wagon 130,000 mi