I dont know for sure that the PCV made the rear main start to leak, but as a precaution its cheaper and much easier to replace that than have to drop your trans and get into all that bullshit for the RMS. Im right around 115k and i did take a bit of a road trip about two weeks ago up to New Hampshire, 6-7 hours each way, don't know if the long drive hours contributed to any of it. Just wanted the community to be aware, the RMS is a pretty big repair and if there is anyway to avoid a failure, I would want the community to know.