SteveK-O (stock!)

My manual transmission is making a whining noise. I know it might not fix it, but I want to try Red Line oil to see if it will help. Which oil should I use:

MTL (GL 4) 70W80
MT 90 (GL 4) 75W90
75W90NS (GL 5+) 75W90 "extreme pressure protection
75W140NS (GL 5+) 75W140 "designed to reduce noise"

Also, what to use in the rear diff?

Lastly, it this change hard to do? I did not find any tech articles on it.

Thanks

Steve-O (98 A4 2.8QMS + 01 Passat GLX 4Motion)

Catfish

xr4tic used Redline MTL 75w90.

xr4tic

and I bought Redline MTL, which is actually 70w80 (I thought it was 75w90)

If you live in colder climates, the 70w80 will provide slightly better shifting when cold.

Audiboy

before. Haven't used the 75w90 yet, but the 70w80 has worked wonders on any tranny I put it - My Mazda and Mitsu Montero and Eclipse. Not for A4 yet, but will do soon.

xr4tic

Right, there is MTL (70w80) and MT-90 (75w90), and I bought MTL.

Audiboy

you know you got MT-90. Other than that, they look exactly the same, including the viscosity which is almost like my 10w40 motor oil. That's why I picked up 5 bottles by mistake oops

SteveK-O (stock!)

Thanks, my local tuner uses says he has "MTL" but it coud be MT-90 afterall