"When the two fluids mix, the mixture overflows into the coolant overflow reservoir with a fluid that looks a lot like a strawberry milkshake (may be a different color if you dont have TOYOTA red coolant..). If the mixture manages to return to the transmission, it can cause catastrophic damage. Often resulting in a ruined transmission. When a milkshake strikes, you will notice your transmission will not want to shift or hold a gear when moving. "
I'm currently running a yellow Prestone mix. The reservoir fluid looks fine, not milky at all. I have no problems shifting or staying in gear. Maaaan, don't freak me out like that. :rockthrow: