How bout the transmission? Is fluid/filter change required? Royal Purple does make something called Max ATF which is Dextron III compatible. I should probably just crawl under there and explore I guess.

Thanks for the teflon sealant tip...I wouldn't have thought to do that.

I've heard similar concerning Mobil 1 and the differential. I didn't use any friction modifier with the RX7's differential (Torsen) and Royal Purple. Most that use the KAAZ (clutch pack) must add a bit of modifier or drive in figure 8's for hours to break it in and reduce the noise.

What's the nicest thing about changing fluids on a VX? No jacks!