Quote:
Originally Posted by Poochie
The M5 AWD/RWD is also the same unit in all the X M vehicles but with the RWD toggle option, electronically disabled.
Although, in theory, having the ability toggle AWD/RWD sounds cool, remember, the vehicle is now lugging around an extra 400lbs or so for the extra components. That's like walking around with skiing equipment strapped on, all year round, in case of that off chance that one day, you might end up at a skiing lodge. So to speak...
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Not only that, even if the front wheel drive system is disconnected from the transmission in RWD mode, the front wheels still need to spin all the drive gear (driveshafts, front diff).