Engine flush??? I know PB Blaster makes a chemical for flushing and revitalizing transmissions that are dirty and slipping. I was woundering if the liquid form of it inthe gallon container would clean deposits out of an engine with out harming anything else? Seems like it would get under deposits and get directly into the pores of the metal and force junk out? The question then would be how long could you leave it in and would it hurt seals? I am guessing here but since it is much more mild then B12 I can not imagine it not being able to be left in for the duration of an oil change? Any idea's????