@Ramki, the Fiero needs 1L oil. It's recommended should be 20w40 (as seen used at the service centers but never checked the manual).
You can happily use the Castrol Power1 Racing (Rs750) or Petronas Sprinta 4T 5000 (~Rs450)... or for that matter any ??W40 Fully Synthetic Oils. Even Motul 300vFL (~Rs 800)is available in ??W40 grade at some places.
Since you said ur bike is run 47K kms, I expect the internals to be decently worn out. On such bikes, oils with higher viscosity do work well... and resist the E.Oil leaking into the head or Petrol vapours leaking into the engine pretty well! So, even the Motul 300v FL 15W50 can be a pretty good choice for u
AGIP Racing 5W40 Fully Synthetic is available in Bangalore for abt Rs 600. Some xBhp members using it in their fieros.