just replaced a Right Side mirror motor in about an hour last night.
the old one was tired and I could see it closing slower thna the left side, until it didnt close at all.
SO i replaced it with an OE motor and motor housing from a pick-your-part car lot (I actually grabbed like 6 of these motors years ago when at a yard, for future use, like last night).
installed and tested and works like a brand new mirror again. AND its just as fast as the left side, again. So, WOOHOO, for like $5. simple fix.
SO< remember, when at a pick your part yard... look for great condiition (no busted motor housings) motors and take them home for future use... cause you WILL need it, one day.

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I swear, my cars are like a girlfriend.
Sometimes its a rough ride, sometimes its smooth motorin'.
Sometimes she doesnt like how i treat her and sometimes i dont like how she behaves.
BUT at the end of the day, she loves it when I am inside her.

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'91 850i
'05 X5 4.4i
'09 Clubman S