Subaru's lightweight 75W80 gear oil

[anthill]

Thanks for the suggestions. You are right that LSD additive is not needed, since early 90s Subarus don't have LSDs

. What can I say, I was confused.

I'm not sure if the Domingo/Libero transmission has enough displacement of the hypoid axes to warrant GL-5. However, since the stock oil is 80W viscosity, and I can't find a 75W80 GL-5, I'm thinking maybe Redline MTL?

 

[mva]

Royal Purple Syncromax is in the 75W80 range:

http://www.royalpurple.com/prod-pdfs/synchromax-ps.pdf

http://www.royalpurple.com/transmission-chart.html

Not sure if it is recommended for Subaru though.