Ford changed a few models to OAT, then backed away from it. VW, Audi, and Porsche are OAT users, too, but most others have resisted. Instead of OAT, most new cars now use a hybrid antifreeze that's formulated with both OAT and the silicate inhibitors from green (Japanese hybrids have different inhibitors). It comes in too many colors to pretend this type is color-coded.
Previously the USB port on the back of the device was locked down and couldn't be used for storage devices, but thanks to the recent updates, additional storage space can easily be added via a USB flash drive. Note that this update is for the Fire TV box only.
The Fire TV affords you 8GB of internal memory, just enough to save some apps, music, and videos. If you want to add personal files or free up space by transferring content to another device, stick a flash drive into the USB port found on the back of the set-top box (sorry Fire Stick owners).