I don't know about the pathfinder, but the pink milkshake in the 4Runner was more about maintenance neglect. Just as the so-called sludge engines were. People would buy or more often lease a Camry based on their sterling reliability reputation, and then NEVER, and I mean NEVER, change the oil. 40k or so miles down the road, and surprise, the engine is sludged. As a master tech at a Toyota dealer back in the day, I got to see those neglected cars first hand.
With the 'pink milkshake', people neglected to EVER change the coolant. Eventually the coolant becomes acidic, and if neglected long enough, eats through the transmission cooler tubing.
The highest mileage 3rd gen I've personally been aware of, was approaching 800k the last time I heard, on it's all original drivetrain. Including the radiator with it's integral transmission cooler. It was maintained by the book it's whole life.