CV joint boot problem...
I doubt how hard you drive has anything to do with the boot tearing. My understanding is that either the boot rubber/plastic dries out in time and cracks, or something hits it hard enough to damage it.
Mine were not dealer installed (non-OEM), but they've held up well so far. One has 40K and the other has 30K miles on it.
Kyle
PS. I don't think it has much to do with your driving style.



