When I was a little Victorian kid I used to say oordee but since I grew up and the world became smaller I realised the correct way was oowdee that's how I say it
Depends on where you are from. I say owdee. Its a bit like Mercedes. Do you say Merseedes or Mersaydes, also adeedas or add did das. Even people from the country of manufacture pronounce the same word differently. If you speak clearly I don't think it matters how you pronounce a word. Except maybe if you say 'f' instead of 'th', that identifies you as a feral, lol.
over here in the US nearly every car brand is pronounced different to in oz. Niss-arn instead of Niss-en, Su-BAR-roo instead of Su-ba-roo, Hun-day instead of He-yun-day, Maz-darr instead of Maz-da. Not sure how they say Audi. I say owdee, thats how i remember them saying it on Sale of the Century when they used to give A4's away back in the day.