How do you say long live chocolate milk in french?

There isn't a direct equivalent of "long live" in French when expressing enthusiasm for something. Instead, you would need to rephrase the sentiment.

Here are a few options:

Formal:

* Vive le lait au chocolat! (This is the most literal translation, using the traditional "Vive" for long live)

* Que le lait au chocolat vive éternellement! (May chocolate milk live forever!)

Informal:

* Le lait au chocolat, c'est la vie! (Chocolate milk is life!)

* J'adore le lait au chocolat! (I love chocolate milk!)

* Le lait au chocolat, on l'aime! (We love chocolate milk!)

The best option will depend on the context and your desired level of formality.