Drive box oil additive?

Technical Small Block V Twins (not new V7s)
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I’m finding conflicting information on this one. With a modern gear oil, do I need the Molykote or Rocol ASO/R additive in the drive box? I’m using Millers Pistonease SAE 85W-140 Mineral which apparantly has “performance additives” but doesn’t state what those additives are.

If I do need the additive, is there a modern equivalent to Molykote A or Rocol ASO/R? I can’t seem to find either for sale.

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if you wish to use it, Halfords (of all places) turned out to be useful when I was looking for this sruff.

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If anything, I’d suggest Slik50 gearbox additive, however most modern gear oils (of the correct grade) are perfectly fine.