The dealers have a glycol test kit for contaminated trans fluid. I saw such a disaster in progress a few weeks ago at my dealer. The culprit was the Valeo-made (Italian) radiator in a C32. The trans cooler and radiator were cross-pollinating and the ATF contamination was beyond the allowable limit. Luckily for the car owner the warranty was picking up the radiator and transmission replacements. The tech said this failure was being seen more often.

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Roger E.