Years back when I had my first car and the front tyres were nearing the limits I took it to a local kwik-fit, a guy came out and measured the depth then told me they still had some life left in them and it wasn't worth changing yet! Got to respect them for that lol.
I've just been googling this for a bit trying to get an answer, there are surprisingly few pictures out there! The only few I've found, along with a matching picture in the car handbook, point to it being a 1.5... I didn't even think this existed in 2012? I'm very confused too now!
I saw an amusing incident involving an X5 once - it was stopped just into a side road with its nearside rear wheel leaning in about 45 degrees. Seemed like it just collapsed while driving, was too far away from the curb to have hit it or anything else! I thought suspension was meant to be strong lol.