A method to make your diesel engine running better especialy after serious mileage

[UFO]

Originally Posted by Phantom

I would rather use power service and up the strength, or run diesel purge directly to the enjectors to clean them.

Bio-D is great and should not kill the pump if the tank is very dirty it could loosen gunk and clog the pump killing it assuming the pump is be for the fuel filter. If after the filter gust get a few cheap ones or an inline and change them a few times. Also from what I remenber Bio-d will wet dried orings/seals and switching back to ULSD can reshrink them causing leaks.

All true, but used in low concentrations (less than 5%) will yield all the lubricity benefits and none of these drawbacks.