Changing Final Drive fluid

["thebrave65" <johnnysher1@xxxx>]

Hi. I've been preparing myself mentally for my purchase which looks 
to be in January. I've been reading my parts and workshop manuals 
and saw that on an automatic, (that's what I'm getting), there is a 
final drive fluid that needs to be checked/changed. What my question 
is: does this need to be changed as often as the trans fluid and what 
type of oil is used for it? I didn't even know about it until I read 
more of the workshop manual. 

That what scares me the most - finding stuff I had no idea even 
existed in the Delorean that needs maintenance.

Johnny