New Delhi, Nov. 9 -- Passenger car sales rose marginally in October after declining for three straight months, mainly propelled by the launch of Hyundai's new Santro compact hatchback. Carmakers on 1 November said, however, they remain cautious on how the industry will fare during the crucial festival of Diwali which falls this month. India's top five carmakers-Maruti Suzuki India Ltd, Hyundai Motor India Ltd, Mahindra and Mahindra Ltd, Tata Motors Ltd and Honda Cars India Ltd-together sold 230,870 vehicles last month, a 2.06% rise from a year earlier. Automakers consider factory dispatches to dealerships as sales. While car sales had been growing at a healthy pace since November last year, boosted by new launches and a recovery in rural de...