Maintaining a strict service interval is essential for the Honda City's i-VTEC or i-DTEC engine health. Interval (Time/Distance) Every 10,000 km or 6–12 months
The manual outlines specific intervals for periodic service, typically every 10,000 km or 6–12 months Honda City 2012 Owner's Manual PDF - Scribd
Sites like eBay or AutoRepairManuals.co often sell CDs or downloadable PDFs for $10-$20. Many of these are scanned copies of the original factory manual.