It’s No-ga-ro!
Considering the word only has 6 letters, it is amazing how often Nogaro is spelled wrongly!  Here are some of the versions I have seen:

Nogano - Autocar mag classified ad: “RS4 in Nogano Blue Pearl”

Negaro - on the AudiWorld forum, frequently

Norago - Edmunds.com post

Nagaro -

Nogara - On the Tire Rack web site.

Negara -

Negro - in an Audi dealer’s ad in the Times!

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