The Deep Creep is the same formulation as the Seafoam, but in a spray can.
I like to spray that through the brake booster hose instead of sucking Seafoam through it - just gives a bit better control of the amount going into the intake.
Haven't had any doubts about recommending Seafoam to anyone with fuel problems - if it solves the problem, all well and good, and at the very least, it'll clean out the fuel delivery system, injectors, valves and cylinders.
PS: I've never tried the Seafoam throught the crankcase either, since I regularly change the oil at every 5000 km (about 3,000 miles) but I may try it soon since I'm approaching the 500,000 km mark (about 300,000 miles), and at this point, it's surely not going to hurt anything.
'03 Ranger Supercab, Flareside, 4.0 liter V6 SOHC, auto, 4 x 4 w/FX4 Off-Road Package (Level I)
Last edited by north44; 08-18-2011 at 04:38 PM.
Reason: added PS