I work in an Automatic Transmission Plant, and I asked the same question the other day. Apparently the Dexron type fluid that is usded has a poor viscosity index, and can attack seals. I'm sticking to proper fork oil!
It doesn't attack all materials. The seals in our transmission are all suitable for the fluid. However I'm not sure if those in forks are. I'll quiz the guy at work again as he seemed to know what he was on about.
Jeremy has worked with the engineers at Mobil for quite a long time before they came up with Mobil 1 ATF. He had a very demanding list of requirements that he needed for a suitable suspension fluid.
After alot of testing Mobil ATF 1 proved its' worth.
Take Care, John
Uh oh, I'm starting to think I jumped in too early here :(
By ATF are you guys reffering to Automatic Transmission Fluid? Which is something I have heard can be used in forks.
I can't help feeling that I seem to have offended members in this forum for trying to post information that I thought may be relevant. I wasn't trying to step on anyones toes. In my defence I did list what type of Transmission fluid I was speaking of.