So the updated parts list recommends "Redline Heavy Shockproof 75W/140 (75W/250)"

I am a bit confused. Is it the heavy shockproof" or the "75W/140?" Are they the same thing? Here....this one:

https://www.redlineoil.com/heavy-shockproof

or this one:

https://www.redlineoil.com/75w140-gl-5-gear-oil

the specs are not the same, and it's not clear if the parts list endorses "LS" (limited slip") additives, or should. Sorry if this is redundant thread or answered in the dark backward and absym of time.

end user