All of us are well aware of the significance of the Engine oil. The engine is considered the heart of a motorcycle, engine oil is what keeps this heart beating for a longer time. While also keeping in mind the value of money and that your bike is 16 years old, I would suggest that you should try Mobil Super Moto 15W-50. It will not only be cost effective as it only costs 1000 INR for 2.5 ltrs, but also it will offer immense protection against the wear and tear caused to the bike which has already been used for a long time now. Although selecting the apt oil for your bike depends on a lot of factors. One needs to look after the technical aspects of the bike and along with you cannot ignore the physical conditions in which the bike is being used. I think this oil is what your bike needs, and it will serve the bike in the best possible way!