This was based off the ^>v game from portugal.

Rules:

^Finds the odd car out and tells the reason
>Keeps empty untill the other user says if it's correct
vAsks if correct

Example:

User 1

> Toyota Matrix, Honda Odyssey and Chevrolet Corvette

User 2:

^ Chevrolet Corvette because it's American
> Cadillac STS, Subaru Impreza and Chevrolet Caprice

Got it? Let's go!

^ Subaru Impreza it's Japanese
> Opel Corsa, Opel Astra and Opel Insignia

previous-generation Astra was the only one sold in USA (searching for something USA-related :D)

I was mostly refering to the Insignia since it's a sedan but that's correct too + 3 cars please.

There was a Corsa sedan, Astra sedan and there is an Insignia hatchback and Wagon though...

Corsa Sedan?!?

Yeah, like this: http://www.imcdb.org/vehicle.php?id=180110

As two-door, too: http://www.imcdb.org/vehicle_340355-Opel-Corsa.html

Of the successors Corsa B and C there were also Sedans (but only in South America)
http://www.imcdb.org/vehicle_280461-Chevrolet-Corsa.html
http://www.imcdb.org/vehicle_331726-Chevrolet-Corsa-Sedan.html

The problem is that many things could be compared between the cars, e.g. I compared countries but it was just about body shape (with an error )

Three other cars:
Renault Mégane mk2, Peugeot 206, VW Golf mk5

The Golf is originally from Germany rather than France, the 206 is smaller than the Mégane and the Golf, the Golf-based cabriolet is not called CC like the other two...

There are about a million different possibilities

And by the way, the Insignia is the only one of the three Opels currently sold in the USA (Buick Regal)

The Golf 5 also wasn't built in Iran like the other two were.

@DeltaGolf > as I said, so many possibilities Shall I wait that someone guesses the right one?
About the Buick Regal, that's just for China, no?

Not from MY 2011: http://www.buick.com/vehicles/current-vehicles/regal/model-overview.html