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As far as I know the transmission is "filled for life" with the oil. Which makes sense, because the gearbox design is very simple. There's an input gear with two bearings 6307, an intermediate gear with bearings 6308, and the differential. That's it. The oil is fully or at least partly synthetic, a degradation is unlikely. Or, in other words, even if a degradation of the oil takes place over the years, it is unlikely that such a simple designed gearbox gets damaged by that.
However, it is important to understand that the XMSN has a centrifugal lubrication, only. When the car was stationed for a while all oil has flown back to the sump by gravity, and it takes some turns until the differential which is immersed in the oil has flinged it to the bearings of the input shaft. Consequently I find it beneficial to allow the car a "warm up" phase, with low to medium speeds and especially low torque, after start for some minutes. Instead of "spuring the horse" directly after leaving the garage.
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