In general, the down payment remains in between 20-30% of the on-road price of the vehicle and ROI varies between 9.25-11.5% and it totally depends on the CIBIL/Credit score of an individual. So, we'd suggest you walk into the nearest dealership to know the final finance quotation and documentation as they will be the better person to assist you. You can click on the following link to see the details of the nearest dealership and selecting your city accordingly - Car Showrooms
Renault Lodgyis still available in the market and it will be discontinued by the brands end by the end of April 2020. So, the maintenance and the availability of spares will be there in the authorized service centres without any delay but the availability totally depends on their stock.