Tesla's Electronic Parts Catalog includes a "Sales Restriction" for each item, which is usually either "Restricted" (you can't buy it without being the owner of a corresponding Tesla) or "Over-the-Counter(No VIN)" (so you can buy it); however, this item is listed as "E-Procurement "... maybe that means you can buy it online? I suspect it can only be purchased by approved companies though a Tesla online portal.
These drive units use the same oil to cool the motor as to lubricate the gears, so viscosity and thermal characteristics would be important in ways not expected in a strictly gearing application.
LUBRICANT,MOBIL SHC 629 | 1055544-00-B |
These drive units use the same oil to cool the motor as to lubricate the gears, so viscosity and thermal characteristics would be important in ways not expected in a strictly gearing application.