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I'll throw in the alternate view point. I had a 14 335 with 6mt and now a 16 340 with 6mt. Both shifted quite well and much better than the myriad of other manual transmission bmws I have owned. I change my fluid in the trans every 25k miles. It's not expensive and easy enough to diy. I tried my go to RedLine fluid for the first change in my 335 and it shifted a little rougher so I drained it and went back to the bmw fluid and it was super smooth again. So with the 340 I have stuck with the bmw stuff.
I say check it out before buying and if it is smooth once warmed up then it's probably fine. Change the fluid for piece of mind.
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