I need to RTFM (it's in the car and I'm in the house... lol) but what's the change interval?

 

There isn't any.

 

What is RTFM stand for ?????

 

read the fucking manual


I flushed mine at 100K.

 

There is no recommended chaneg interval, but if you plan on running the car into the ground, replacing the old worn fluid is definitely worth it.

The simplest way is partial fluid changes every few drives by sucking out the fluid from the reservoir using a turkey baster, or any kind of similar device you can use.