Chevrolet 2013 VOLT Owner's Manual page 275

Service and Maintenance 11-5
Service Operation Interval
Replace pollen filter. Every 45 000 km (30,000 miles) / 2 years
Replace air filter. Every 60 000 km (40,000 miles) / 4 years
Replace spark plugs. Every 150 000 km (100,000 miles) / 10 years
Replace engine / HV coolant. Note: Every 240 000 km (150,000 miles) / 5 years
All vehicle coolant.
Replace electric drive unit oil. Every 150 000 km (100,000 miles)
Replace auxiliary belt. Stretch belt: Every 150 000 km (100,000 miles) / 10 years
Replace timing chain. Every 240 000 km (150,000 miles) / 10 years
Air conditioning system - flush and Every 10 years
refill and dessicant replacement
General Maintenance Items
Item Service Operation
All Check all systems for interference or binding and for damaged or missing
parts. Replace parts as needed. Replace any components that have
excessive wear.