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Originally Posted by ttimbo
The X1's transmission oil cooler is independent of the engine cooling system.
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According to the X1 training document, the engine, engine oil and transmission oil all use the main radiator:
Quote:
F48 Powertrain
2. Cooling System
In vehicles with an automatic transmission, a transmission oil-coolant-heat exchanger is also flangemounted at the transmission. This is supplied with coolant via the crankcase and adapted coolant hoses.
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This is consistent with the vast majority of light-duty vehicles.
There is also this excerpt about the transmission itself:
Quote:
F48 Powertrain
3. Automatic Transmission
The excellent efficiency was able to be achieved by the following measures:
• Small oil pump
• Lower transmission oil main pressure
• Optimal lubricating oil quantity
• Transmission oil with low viscosity
• Large steering axis inclination
• Very accurate control of the multidisc converter lockup clutch at low loads by three-line activation
• Designed for automatic engine start-stop function (there is also an electric oil pump in the hydraulic block in order to maintain the minimum oil pressure)
• Designed for idle speed coasting
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Dunno about you, but my interpretation is that the transmission was designed for efficiency at all cost. All those "efficiency improvements" are the opposite of what you would want for towing.
Translation: Tow anything but the lightest of loads over roads that aren't flat at your own risk.