I've used Redline in all my Z's for over 10 years now and finally switched to Royal Purple 75-90 and I couldn't be happier. The difference is night and day and I've used everything from the whale oil the 99 trans ships with, redline and generic stuff just to get by and nothing compares to the royal purple. Just thought I'd through it out there since the consensus on here seems to be Redline is the end all be all of trans fluid when I found it to be the complete opposite.
Follow Ups
Just a PSA on tranmisission oil - Evan(CA)04:45:39 12/02/15