Note to remember-- Some have learned this the hard way---$$$$
Do NOT inject Seafoam, or anything else in the intake of any diesel. The diesel engine has no throttle, so the engine will "Run Away", and will continue to increase engine speed until the engine blows, or it runs out of the product you have put in the intake. Turning off the key does nothing, as there is no spark used.
Adding it to the fuel filter or fuel tank, is OK
Chevy 04.5 LLY, 2X, shell, XDR, MikeL Heavy duty up-grade, 6spd, TransGo, deep pan, de-badged, 65 Gallon replacement Aero tank, LBZ-mp, Kennedy pump, shimmed, Pre-fuel filter, tow mirrors, BU cam, gauges, GPS, Sirius, bags, custom grille, fender vents, HD trans cooler- Curt front hitch, footwell lights, load lights, Studs, head gaskets.