nsta: As stated up the top of this forum, This is *NOT* the place to ask questions or to try and get help.
There is no need to create two threads in differnt forums asking the same question. All you are doing is effectively making it hard to find all the answers from everyone.
As has been said before to you, please make the effort to search for the info you're looking for, because the majority of questions you ask have been asked before, several times.
I just did a quick search and found the following threads about flushing your coolant:
http://www.skylinesaustralia.com/forums/in...showtopic=96319
http://www.skylinesaustralia.com/forums/in...showtopic=69726
http://www.skylinesaustralia.com/forums/in...showtopic=62427
http://www.skylinesaustralia.com/forums/in...showtopic=53159
http://www.skylinesaustralia.com/forums/in...showtopic=12332
These two are for RB20 and RB26 but should give you some good advice
http://www.skylinesaustralia.com/forums/in...showtopic=43402
http://www.skylinesaustralia.com/forums/in...showtopic=67730
and this thread mention what sort of coolants to use
http://www.skylinesaustralia.com/forums/in...showtopic=27793
Vijay