I don't know what you guys consider high milage, but I did the flush on my 95 with 104K on it. I qalso put in 5W30 Amsoil synthetic oil and it has been fine. No leaks, no problems. If you have run only reg. oil so far, I would say the flush would be benificial. The leaking oil people speak of may happen switching to synthetic even if you don't do the flush. I would still recommend synthetic though. It flows better in the winter and can withstand more milage and higher temps. The oil I have now is rated for 25,000 miles or 1 year, whichever comes first. I don't have to change my oil until next summer, which really makes me happy. All I have to do is replace the filter in february and I'm set. i highly recommend Amsoil's full synthetic 5W30.