Hi Zain, Let me clarify, with great care means, it is sensitive, especially engine. It needs regular tune ups etc. 150k on the odo means it is driven more than 150,000 to date. No work means , engine is in it's original condition and performing well.
Santro got powerful engine, in 100cc you can really feel it. But it should not be driven above 120km/h keeping safety in view.