gathermewool
Site Donor 2023
In my search for the perfect fluid for both the tranny and rear diff of my 08 STI I've come across what some seem to think is the bees knees when it comes to Subie trannies - Go Extra S 75W-90. If you do a quick search you'll find that it's only available in 20L (~5gal) buckets. The quarts can be found, but at a premium paid to those few who have transferred this wonderful fluid from said buckets.
My questions are: who makes it; have any of you tried it; and is any GL-5 gear oil really better than another? I want to do what's best, but I'm thinking the mysterious and hard-to-get factor with this oil may lead some to "feel" improvements after a change when none exist - at least no improvement that couldn't be had by any other gear oil of the same spec.
Thanks for your input!
My questions are: who makes it; have any of you tried it; and is any GL-5 gear oil really better than another? I want to do what's best, but I'm thinking the mysterious and hard-to-get factor with this oil may lead some to "feel" improvements after a change when none exist - at least no improvement that couldn't be had by any other gear oil of the same spec.
Thanks for your input!
Last edited: