There are two lounges at KUL, one in the satellite terminal and main terminal. The big MH lounge is in the satellite terminal, but IMHO the regional lounge (in the main terminal) is much better, it is smaller and more intimate - it has some sofas facing the windows you can stretch out on. You can of course do both lounges, irrespective of where your flight is departing from, but in all likelihood the flight to CGK will be departing from the main terminal (therefore regional lounge will be closest), but MH 140 could arrive at either the main or satellite terminals.
Thanks for this info. I will def check out those two lounges since I got plenty of transit time. I have been always flying SQ so I don't expect MH lounge to be as good as SKL.