They will only do it up until the car is 10 years old so its worth bearing in mind if the car is older and not had it done, also it would be basiclly impossible to check it on a car you were thinking of buying without a ramp and even then its tricky to see as there such a maze around the back end, ive heard they can even be funny about it on a car under 10 years depending on the dealer. I had mine done no problem though, totally free and even got a courtsey car! Unfortunatley is wasnt a new m3 though.....