ZIC FF is company recommended for almost all front wheel drive suzukies. I am using the same in my 1996 khyber and no problem.
Dont go for any GL-5 gear oil, its meant for heavy duty purpose and may damage synchros in your margalla's transmission.
If the oil level is OK then dont worry about it. It will get better with time as the oil will get more viscous with circulation, temp and load. If you want an urgent treatment for the issue, you can try adding oil treatments available in the market for manual transmission.