As much as it has with the Quattro brand, Audi (and its parent company Volkswagen) have more recently turned the letters TDI into an emblem of what it stands for as an automaker. Think of those three letters and you could picture no other marque, that's how closely intertwined the two have become. But an attempt to enshrine that much in law has apparently failed.

According to Autobild, Audi went to the European Union courts in Luxembourg – on behalf of its parent company as well in its own right – to secure dominion over the TDI badge, but in a ruling this week, the judge ruled that the acronym is not theirs alone. Apparently the judge felt that the letters apply to a technology that is common with other automakers – namely turbocharged diesels with direct injection – and therefore rejected Audi's claim of ownership.

The company apparently owns the name in individual countries, so any attempt by a rival automaker to use the name would undoubtedly prove difficult. But as far as the European Union is concerned, it's not illegal.

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    • 1 Second Ago
      • 4 Years Ago
      I hereby trademark "flathead screwdriver".
      Andre Neves
      • 4 Years Ago
      Wow. Really? How about trademarking ABS, DOHC, & AWD while they're at it?
      • 4 Years Ago
        • 4 Years Ago
        How about we eradicate you from this earth? You're the same fool with a different name. I can see your IP, You're a pathetic excuse of a person.
      • 4 Years Ago
      Well here in europe there are many other cars that use TDi aswel which is why they got rejected. They shouldnt have tried trademarking it in the first place, Its like the GDi (petrol technology) Loads of cars use it.
      • 4 Years Ago
      who cares, TDI will always be remembered as Diesels of the VW empire, even if someone else names their engines TDIs.
      • 4 Years Ago
      Yeah, it seems like VW just needs to come up with another name for it, like they use trademarked FSI instead of GDI.
      • 4 Years Ago
      Other makes should have to beat Audi at Le Mans to gain the right to use TDi
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