Auto-RX in my read diff (04 STi)

[Vspec]

I've been using SF HDS5 without the LS additive per Mula when he had SF open. I used it twice for services in the rear diff of my 2004 Subaru WRX STi.

At the first drain of SF it came out almost the same mint looking green as it went in.

However I added Auto-RX in my rear diff with the SF and drove WAY over the application of 1,000 miles, probably more like 5,000 miles or so.

So today I drained the SF and Auto-RX and MAN was the fluid BLACK.

Completely black, and smelled horrid. Im replacing it with Amsoil SVG which I ordered through Pablo (and my Amsoil EA airfilter)

I'll let you guys know how my rear diff likes the Amsoil.

 

[bulwnkl]

You know, I just used ARX in my Baja diffs and the rear diff showed me the same thing. I had drained and re-filled with Valvoline 75W90 just for the ARX rinse and it came out quite black (went in a nice honey color). The front diff wasn't that way on mine, though. How was yours?