Hi All,

synthetics are known to leak out of old seals, read that sometimes the seal
will 'come back' after a while.  If not back to dino.  As far as seals go
though, not just in input shaft seal would leaks, what about both drive
flange seals, shift linkage seal and maybe diff-lock on Syncros? Price out
all these seals, add the cost of synthetics, and you can do a lot of dino
oil changes every 2 years.  If only one starts to leak out, likely others
aren't going to do real well either.
Synthetic buys you peace of mind if you want the oil to last years and
years. As far as reducing shifting effort....   wonder how much of that is
due simply to clean/full oil? A rinse with ATF and some brief gentle driving
before refilling with dino will clear out even more residue and help smooth
things out. I prefer to change the dino out every two years, that way I have
a good idea it's got lots of oil. But granted a leak like Tom had would run
me dry also. In the Syncro I do stick my finger in the fill plug hole more
often, every few months just to check, more worried about water in than oil
out. My seals seep, but after 11 years and lots of dirt topping up
infrequently is a small price.   bye, Tim