I think it is an oil reservoir or a shaft,where the transmission oil passes through it and is surrounded by the engine cooling water. If it just leak, you'll get water in the tranny and the tranny is overheated and destroyed in a matter of mins. It is famous here in my country whenever purchasing a used car to replace that cooler as a highly important safety measure. is it called something else?
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X5 3.0i SUV
2005 -113000 miles
GM-A5S 690R Tranny
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