Quote: Read the Allpar link. It says that newer ATF does not play well with old style trans seals and will cause leaks.
Why is info on one site any more creditable than another? After all, it's just one person's opinion/experience.
In most cases when you hear tales of one particular type of fluid causing seal deterioration/leaks it's because the type of fluid was changed in an aged unit. If that particular fluid was used with the same seal material in a fresh unit there would be no leakage problems. Check the part numbers of the seals and see how many have gone unchanged.
The ATF+ fluids are formulated for modern 4-speed automatics with lockup converter and planetaries that run continuously, and need the extra lubrication properties.
Much different than the non-lockup 727 that will do just fine on just about any type of fluid.
