dont put the whole bottle in, add about 20% mix with water to your system. i think the recommended dosage is on the bottle.
if memory serves, flush original muck out first with water til its as clear as you can get it. then put forte mix in, run engine til stat opens and put ecc on full to aid circulation. take it for a run and when it's cooled down flush out with water. with bottom and top of system open pump water through. repeat process with water. then again with forte mix. repeat the process all over again and again. you'll need to do somewhere between 12 and 20 flushes to get it clear depending on level of contamination.
it is unlikely you'll get this done in a day or two for obvious reasons, and as you're only adding a 20% forte mix i wouldnt worry about running the car with it in providing its not in for excessive periods. a day is fine and if anything will ensure it is reaching all the parts it should. my complete flush took a week to do. others on the forum report two.
i used two bottles of forte in total, and the water was running as clear as ive ever seen by the end of it. finally emptied out the clear water and started adding a 50/50 mix of the red stuff. depending on your method of flushing, you will need to flush the red stuff through two or three times as the v6 only half empties its coolant system when you open the radiatior valve.
hope that helps
