Guess That Car game - By Clues Only

Is the sister car, that is still being built, essentially the same, or has it been massvely changed over the years?
 
Not a renault 12, not a sportscar, and the sister car is a rebadged version of the car I'm looking for. Production of the sister car started in the mid 1970, there's hardly any car that hasn't changed dramatically since then, this one included.

Clue #4: Peter, you should be rather familiar with that sister car! ;)
 
^ Yes it did!

Next:
Clue #1: This car has a V6 engine.

Clue #2: There have been two versions of this car.
 
Is this car exclusively V6, or has it had other engines as well??
 
By two versions i mean the first version came out, and then another replaced it :)
Nothing to do with different bodies,etc.

Clue #3: It isn't exclusively a V6 but the V6 version had other exclusive features.
 
Alfa GTV or Audi TT? At the very least, I'm guessing it's not American.
 
Not an Alfa GTV or Audi TT. And no, it's not American.
 
IMO, the only way this game is going to work is if the clues are more specific right off the bat. They should focus on the unique features, specifications, technology, etc. of that particular car. Some of these clues are much too vague..... just a suggestion. ;)
 
Hmm - you don't mean the Citroen SM by any chance?

And I don't mind if the clues only give a first vague hint in the beginning,though you should be able to read something out of them.
 
No Mazda.

Clue #4:
Is it european.
 
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