Dexcool sludge isn't a MYTH by any means.

It causes problems because people neglect their cars, hence it gunking up, getting hot, melting LIM gaskets, and coolant puking into the rotating assembly chucking motors.

If you were to get updated Aluminum Lower Intake gaskets, flush and vacuum the radiator with Dexcool every year or two...I'd bet you wouldn't have any issue...ever.

It's called maintenence...people need to learn it, that's all. Friggen' lazies.