Market Trading Guide: Buy Oil India, Tata Steel and two more stocks on Wednesday for up to 8% potential upside

Nifty closed higher amid volatility on monthly expiry, driven by gains in financials, IT and metals, though auto and FMCG lagged. Analysts see 24,900 as support and 25,500 as resistance, recommending OIL India, DCX Systems, Tata Steel and Sona BLW.