IIRC the "normal" operating temp for them is about 80C (180F±) but I am sure someone will correct me if I am wrong.

The stock cooler is OK for normal use. Heavy duty use like towing usually calls for a heavier duty tranny cooler and radiator. That is usually what a "towing package" consists of. Sometimes they also add a larger oil cooler too.

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Marty D.

2013 C300 4Matic
1984 BMW 733i
2013 Lincoln MKz