Just to add, similar with my Mondeo I bought from Ford main dealer many years ago, had 3 diff makes of tyre on, when I mentioned it they just said if it was issue then service department would sort it. Surprise, surprise nothing happened, so I soon got 2 new tyres myself, but got good price on car so I factored it in. They stood out cos one was very new high end make another a very used budget make.