2/3 in the tank and 1/3 in the intake via the booster line. After it sucks in the fluid, shut the truck off for about 5 minutes to let the chemical work on the upper valves. Start the truck (may stall 1 or 2 times before firing up) and let it idle for about 1minute. Then, hold about 2000 rpms for 1-2 minutes as the white smoke pours out. Let the truck idle and then take it up and down the street until all smoke is gone.
It's good stuff. Used on all of my vehicles.
2004 Ford Ranger 4x4 XLT.....4.0 V6....4.10 rear
2" torsion key crank
235/85/16 Goodyear Duratracs
Gibson exhaust (POR20 coated)