[drdisque]

no, you don't HAVE to change the filter, but it can't hurt and is a no-brainer if you plan on taking the pan out. There are several different ways to change the fluid, and if you plan on changing the filter, the best way is to just drop the pan off, empty and clean it, change the filter, fill the pan with a little fluid, bolt it back on, and fill it the rest of the way with the fill tube.

No, you cannot use that fluid, you must use the fluid listed in your owners manual or one listed as being compatible to it.