Chevrolet Low Cab Forward 4500 2019 Series Owner's Manual page 273

272 Service and Maintenance
Maintenance Schedule Table
Letters Used to Indicate Maintenance Service Types
I : Inspect then clean, repair or replace as necessary
R : Replace
T : Tighten to the specified torque
L : Lubricate
No. Service Interval
1 Engine oil (2) (4)
2 Engine oil filter (2) (4)
3 Cooling System Service
4 Engine Coolant (2)
5 Air Cleaner Filter (2)
6 PCV System (2)
7 Spark Plugs (2)
8 Spark Plug Wires (2)
9 Fuel Tank, Cap, and Lines (2) (6)
See Explanation of Complete Vehicle Maintenance Schedule
See Explanation of Complete Vehicle Maintenance Schedule
- - - I - -
- - - - - -
- - - - - -
- I - - - I
Every 80 000 km (50,000 mi): R
Every 48 000 km (30,000 mi): R
- - I - - -
Every 160 000 km (100,000 mi): R
Every 160,000 km (100,000 mi): R
- - I - - -
Service
intervals
months or
kilometers
(miles)
whichever
occurs
first (1)
or every 12 months
or every 12 months
- - - I or every 24 months
- - - -
- - - -