VLSD = Doesn't matter what oil you use. Seriously.
Gear oil will NOT affect how well the VLSD locks up. EVER.
75 and 80 weight is SUCH a small difference, don't even bother.
Sure heavier oil helps "protect" better, but 75-90 is fine.
If you're paranoid you can always run 80w140, but in all honesty its overkill. There's so little friction inside a vlsd pumpkin that it wouldn't even matter what you ran.
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