For those who find this post via the search function (its got a good title), only use Volvo gearbox oil in the manual boxes of the 400 series and for S/V40 gearboxes of the same family (reverse is top left via a lifted collar on the gearlever).
These gearboxes require bespoke additives different from those in standard gearbox oil. Specifically, these bespoke additives avoid the corrosion to gearbox internal which will occur with standard oil. (different materials for Volvo upgraded boxes compared to the Renault originals. Volvo suitably redesigned and amended material choices for their gearboxes).
More discussions on 480-europe.org but here's the summary.
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