I don't remember for sure now, MXV's I believe, since I just traded that car in, but they had high temperature and speed ratings.
I've bought them for years. Never had a failure except once when I slammed into a curb, and it was replaced on the "road-hazard" warranty.
The new Q45 came with Bridgestones, which I'm leery of, on 18" wheels.
I'll keep a sharp eye on them.
...Jim Thompson