Yeah one-wheel-peels are fun in high school, just not good for your daily driver that you DONT want to break! One of the local cars that I built a few years back gets its share of rough treatment and lots of very harsh burnouts and many of them being one wheel marks for well over a hundred feet at a time. A year or so back we had the drivetrain out for some engine work and to install a 3.29 single chain conversion and the diff was still like new. The car has over 135K one it and is the original diff and again it had tons of one wheel burnouts. He has been using my fluid mix since I built the trans 3 years ago and has definately proven its worthiness in differential longevity.