A few weeks ago, I had a whole day of driving without a hitch until a couple of miles from home. My car shut down unexpectedly with the red triangle of death. Cutting to the chase, I immediately took my car to an specialized Toyota indie shop instead of a dealership, because of budget. Apparently, I needed to change my inverter coolant system. It wasn't under days later while I was looking through my invoice that I remember the coolant tank under the Prius hood indicated that the coolant needed to be Toyota proprietary brand. So my question here would be: Are proprietary Toyota brand coolant for inverter coolant system exclusive only to Toyota dealership mechanics, or do indie mechanics have access too?