A few months back I posted that a coworker who drove a company vehicle (2011 Toyota Sienna) that went close to 360K miles on the original transmission fluid before it failed. Yes, 360K miles without changing the transmission fluid, ever.
That is amazing if you ask me. Here is the link to the thread...
Toyota Longevity
Basically everything was all original beside engine oil, filters, power steering pump, water pump, brakes and tires. He did nothing else on that mini van.