Re: Front differential oil
I checked the Canadian version of the maintenance schedule. The way I read it, you check for leaks annually, and only if there are leaks do any more. I don't see any fluid replacement required in the schedule. No replacement with a standard auto transmission, unless it is used for trailer towing. There is a scheduled fluid replacement frequency for the manual transmission - every 32,000 km.
If you go on line to the Toyota site I believe there is a place where you can enter your specific car details with mileage and it gives you a list of what is needed. Would be a good way to check.