How do i rotate set of models that make a bigger model(a car) to 0°? How do i rotate a set of models(created from main model, i call them submodels, the project i am working on is a car mod for a computer game(Beamng [Link for forum post][1],

Basically i imported the model from a website(after i got permission from the site, provided i dont make any profit for the end project and it will be avaible for everyone(everyone who owns the game legally atleast)

When i imported the model, it got rotated 0.6 something degrees in W/E directions, how do i rotate whole model to 0 degrees(as it should be)?

I know i could like join the submodels(set of models making a car body, eg chassis, doors, bonnet, lights, glasses) whit ctrl+J, but that might/will break my UV maps and all the job i have done on it....

These are the files of the model i have right now, part of the original problem was fixed(model rotation, but axis rotation still remains)

https://drive.google.com/file/d/0B6vRqq08Rx2JeTdqYzRicGJaMDA/view

https://www.virustotal.com/en/file/bd2528331b1fea82a6d84998460b89e4997fa0b9317a0a39fabbc5497a21efe0/analysis/1500458932/
If you select several objects and begin a rotation using the r key they will rotate as a unit, preserving relative position and orientation (unless pivoting around Individual Origins).

If the pivot point that blender picks (default is median) is not to your liking, you can change the pivot point to something like Cursor or maybe Active Element.  The 3D Cursor can be set to any coordinate using the n sidebar.