Super Unleaded or not?

[Law_kenuk]

Hi

I live in England but my sister lives in LA!

She has just bought a 2002 C class Merc (V6, 2.4 auto I think) and was told to run it on super unleaded (or whatever you guys call the premium unleaded rating?).

In the UK most cars will run on either grade of unleaded although performance may be effected. Is the same true in the states?

Thanks

Liam