Oz-en-Oisans is about 560 miles (900km) from Calais, and takes about 10 hours of driving. Motorway all the way to Grenoble. And then its about 55km. The final 15 mins, climbing up a good road to Oz Station might at times might need snow chains, but the roads generally are kept in good condition. There is now a legal requirement to carry snow chains or socks or have snow tyres from 1st Nov - 31st March.
Road info line…(click for information)