I just paid to have mine done. Next time I do it myself. The mechanic who did it does it quite often and said he used teflon packing which should be good for 5 years. I'm guessing/hoping its the Gore GFO that was mentioned. The original price was sky high and when I complained
the owner of the company justified the price by stating "no body wants to do them"??....well he adjusted the price, and "I" want to do them now.