The water method or "Coke bottle" method, it was where, in the days of carbs, the mechanic would fill a bottle of Coke with water and slowly dump it into the carb for carbon removal.
I did a internet joke about "Coke in the carb" where I posted (after someone posted about water in a Coke bottle for carbon removal)"I poured a bottle of Coke in the carb and the Land Cruiser doesn't run any more!!!!"
Anyhow, you would think after all the years that there would be a better way to remove carbon than plane old distilled water.
My Land Cruiser FZJ80 has just turned 300,000 mi on it.
I know the three rear cylinders are full of carbon from a bad 02 sensor.
With the old motor, what method would be the safest?
I have use the Seafoam method for years but that was with just normal carbon removal not heavy carbon build up removal.