Same here! It's so easy to get the tail loose on my car (when I want to), I'm assuming/hoping it has Posi, but it really got me curious the last time I did it.

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'13 F10 BMW 535i ///M Sport : Jet Black/Black-Anthracite : Premium & Technology Packages/Sport Auto Trans/Camera/Park Distance Control/Heated Seats/Tinted Windows/Blacked Out Markers/Performance Spoiler.

Ex M-B's: '11/'10/'06 E350's w/ AMG Sport Package, '02 S500 w/ Every Option.