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In general the zf transmissions seem very durable.
Not exactly related. But a data point. I have a 2011 335d with a zf6hp28 and folks have pushed those transmissions to 700lbft, for years without failure. Which is well in excess of the 525lbft max torque rating. On modified diesels we’ve hardly ever had anyone report a transmission failure.
I have no doubts that zf builds a good product. It’s not like fords older transmissions where routine maintenance was every 60k miles replace the plugs and the transmission.
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