TCR Estima/Previa/Tarago Differential Fluid Change

Differential oil change in my 1999 Toyota Estima Lucida TCR10G model @ 250,000km. This is not a "how to" just something to use a reference for my service history but if it helps someone out its a bonus. Was also done in New Zealand on the 8th December 2016. Anybody know how often to change it? I am guessing around 50,000km. Also will have a video coming soon of the Transmission drain and top up. Shout out to ToyotaTorago1992 for lots of info on Maintenance for TCR Vans    / toyotatarago1992   Also a link to the facebook Toyota Torago, Previa & Estima TCR Club   / tcrclub