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If it's any help, from what I've been told the limited slip additives might not be such a big deal. I ran Red Line 75w90ns in the diff of my last bmw (no limited slip) because it doesn't have the friction modifiers. When it came time to change it again I checked with Red Line, and they told me the regular 75w90 would actually be a better match to use even in an open diff, as it'd likely run a little cooler.
The viscosity difference is really interesting though, that castrol being 75w-140 vs. the 75w90.
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