I could use your help in understanding something I just read about using synthetic oil and engine seals. I got this from the auto rx FAQ: http://www.auto-rx.com/pages/faqs.htm "Q: I've heard that synthetic oil can adversely affect my seals. Does Auto-Rx® help? A: We believe that high-mileage engines using synthetic/semi-synthetic or high-mileage oil weaken the seal material and it loses its pliability. For those who have rear main oil seal leaks and want to use Auto-Rx® to try and stop them, we tell them to use non-synthetic oil to firm up the seal material after Auto-Rx® has cleaned it, as the chemistry in non-synthetic oil makes seals harden just right to effect a tight seal. After your leak is stopped, you can use any oil you want We question why anyone would want to go back to a chemistry that will start the process of seal material degradation all over again. One way around this problem is to use 3 ounces of Auto-Rx® with each oil change after a rear main seal leak is stopped. Now you are protecting seal degradation and can use synthetic, semi-synthetic, or high-mileage oil without creating a new leak problem." Comments?