Chevrolet 2015 Corvette Owner's Manual page 300

Additional Maintenance Every
30 000 km or 2 Years
In addition to the items listed under
Inspection every 15 000 km or
1 year the following items should
be carried out every 30 000 km or
2 years (whichever occurs first):
Passenger compartment air
filter replace.
Engine Air Filter Replacement.
Additional Maintenance Every
72 000 km
Rear axle fluid change.
Replace brake fluid (or every
three years, whichever occurs
first).
Replace clutch fluid (or every
three years, whichever occurs
first).
Manual gearbox fluid change
(severe operation).
Additional Maintenance Every
150 000 km or if Necessary
Spark plugs replace
Additional Maintenance Every
240 000 km
Engine cooling system drain and
refill (or every five years,
whichever occurs first).
Service and Maintenance
Conditions Requiring More
Frequent Maintenance (Severe
Service)
Extreme temperatures.
Heavy city traffic.
Hilly or mountainous terrain.
Dusty, muddy or off-road
conditions.
Commercial use.
Most trips less than 6 km
11-3