Chevrolet 2012 Sonic Owner's Manual page 304

11-8 Service and Maintenance
Footnotes Maintenance
Schedule Additional Required
Services Severe
a) Or every two years, whichever
comes first.
b) Check all fuel and vapor lines
and hoses for proper hook up,
routing, and condition. Check that
the purge valve, if the vehicle has
one, works properly. Replace as
needed.
c) Or every four years, whichever
comes first.
d) Or every 10 years, whichever
comes first.
e) Or every five years, whichever
comes first. See Cooling System on
page 10 15.
f) Or every 10 years, whichever
comes first. Inspect for fraying,
excessive cracking, or damage;
replace, if needed.
Special Application
Services
Severe Commercial Use
Vehicles Only: Lubricate chassis
components every 5 000 km/
3,000 mi.
Have underbody flushing service
performed once a year.