@nimskhan , I didn't go for engine overhaul. Rather I changed my engine oil brand from Shell HX5 to SGO Ultimate (Suzuki Genuine Oil). That solved my problem. 1st time, when I switched to SGO from shell, the oil reduced a bit.. 2nd time it didn't reduced a single drop even after 2500km. Third time SGO reduced too much that I had to change back to Shell HX5.
In the meantime, i noticed that my fuel pump was also leaking petrol. So I got that change before changing back to SHell HX5 oil. Luckiliy, this time Shell HX5 didn't reduced.
So instead of overhaul, try changing your oil brand. Which brand are you using at the moment?