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Service Intervals & Specifications

REPLACEMENT INTERVALS

Component Interval (Miles)
"A" & "B" Series
Accessory Drive Belt (1) 60,000
Air Filter (2)
Automatic Transmission Fluid & Filter (3)
Differential Fluid (4)
Engine Coolant (5)
Fuel Filter (6)
Oil & Oil Filter (7)
Spark Plugs 100,000
"C" & "K" Series
Diesel Engine
Accessory Drive Belt (1) 60,000
Automatic Transmission Fluid & Filter (8)
Engine Coolant (5)
Fuel Filter (2)
Oil & Oil Filter (9)
Gasoline Engine
Accessory Drive Belt (1) 60,000
Air Filter 30,000
Automatic Transfer Case Fluid 50,000
Automatic Transmission Fluid & Filter (10)
Engine Coolant 150,000
Fuel Filter 30,000
Manual Transmission Fluid (11)
Oil & Oil Filter (7)
Spark Plugs 100,000
"E" & "J" Series
Accessory Drive Belt (12)
Air Filter 30,000
Automatic Transmission Fluid & Filter (13)
Brake Fluid 60,000
Differential Fluid 30,000
Engine Coolant (14)
Fuel Filter 30,000
Manual Transmission Fluid 30,000
Oil & Oil Filter (15)
PCV Valve 50,000
Spark Plug 60,000
Spark Plug Wires (16)
Transfer Case Fluid 30,000
"G" Series
Diesel Engine
Accessory Drive Belt (1) 60,000
Air Filter (2)
Automatic Transmission Fluid & Filter 50,000
Engine Coolant (5)
Fuel Filter 30,000
Oil & Oil Filter (9)
CNG & Gasoline Engine
Accessory Drive Belt (1) 60,000
Air Filter 30,000
Automatic Transmission Fluid & Filter (17)
Engine Coolant 150,000
Fuel Filter 30,000
High Pressure Regulator Filter (CNG Engine) 60,000
Oil & Oil Filter (9)
Spark Plugs (18)
"L" & "M" Series
Accessory Drive Belt (1) 60,000
Air Filter 30,000
Automatic Transmission Fluid & Filter (2)
Engine Coolant (5)
Fuel Filter 30,000
Oil & Oil Filter (9)
PCV Valve (1) 100,000
Spark Plug 100,000
"S" & "T" Series
Blazer, Jimmy Canadian, Sonoma & S10 Pickup
Accessory Drive Belt (1) 60,000
Air Filter 30,000
Automatic Transfer Case Fluid 50,000
Automatic Transmission Fluid & Filter (4)
Engine Coolant (19)
Fuel Filter (20) 30,000
Oil & Oil Filter (21)
Spark Plugs 100,000
Bravada, Envoy & TrailBlazer
Accessory Drive Belt (1) 60,000
Air Filter (22)
Automatic Transfer Case Fluid (23)
Automatic Transmission Fluid & Filter (3)
Engine Coolant (19)
Fuel Filter 15,000
Oil & Oil Filter (24)
Spark Plugs 100,000
"U" Series
Accessory Drive Belt (1) 60,000
Air Filter (2)
Automatic Transmission Fluid & Filter (25)
Differential Fluid (4)
Engine Coolant (5)
Fuel Filter (6)
Oil & Oil Filter (7)
Spark Plugs 100,000
"Z" Series
Accessory Drive Belt (26)
Air Filter (2)
Automatic Transmission Fluid & Filter (25)
Engine Coolant 100,000
Fuel Filter 100,000
Oil & Oil Filter (27)
Spark Plugs 100,000
Timing Belt (28)100,000
(1) Inspect and replace as necessary.
(2) If used under severe conditions, replace every 15,000 miles. If used under normal conditions, replace every 30,000 miles.
(3) If used under severe conditions, replace every 50,000 miles. If used under normal conditions, replace every 100,000 miles.
(4) If used under severe conditions, replace every 7500 miles. If used under normal conditions, periodic replacement is not required.
(5) Replace every 150,000 miles or 60 months, whichever occurs first.
(6) No scheduled replacement interval is given by manufacturer. Check and replace as necessary.
(7) If used under severe conditions, replace every 3000 miles. If used under normal conditions, replace as indicated by CHANGE OIL SOON light or every 12 months, whichever occurs first.
(8) On Allison LCT 1000 transmission only, replace at 15,000 miles if used under severe conditions. An all others, replace at 50,000 miles.
(9) If used under severe conditions, replace every 3000 miles or 3 months, whichever occurs first. If used under normal conditions, replace every 7500 miles or 12 months, whichever occurs first.
(10) On vehicles equipped with 8.1L engine and Allison LCT 1000 transmission, replace at 25,000 miles if used under severe conditions. If used under normal conditions, replace at 50,000. On all other transmissions, if vehicle's GVWR is greater than 8600 lbs (3900 kg) or if used under severe conditions, replace every 50,000 miles. If used under normal conditions, replace every 100,000 miles.
(11) On Cab & Chassis, periodic replacement is not required. On vehicles equipped with 4.3L or 4.8L engine, replace at 150,000 miles. On vehicles equipped with 6.0L engine, replace at 200,000 miles.
(12) Inspect every 30,000 miles or 24 months, whichever occurs first. Replace as necessary.
(13) If used under sever conditions, replace every 15,000 miles or 7.5 months, whichever occurs first. If used under normal conditions, replace every 100,000 miles.
(14) Replace every 30,000 miles or 30 months, whichever occurs first.
(15) Replace every 7500 miles or 7.5 months, whichever occurs first.
(16) Replace every 60,000 miles or 60 months, whichever occurs first.
(17) If vehicle's GVWR is greater than 8600 lbs (3900 kg) or is used under severe conditions, replace every 50,000 miles. If used under normal conditions, replace every 100,000 miles.
(18) On CNG engine, replace at 60,000 miles. On Gasoline engine, replace at 100,000 miles.
(19) Replace every 150,000 miles or 60 months, whichever occurs first.
(20) Replace on 4.3L engine only. Information for replacement interval on 2.2L engine is not available from manufacturer.
(21) Replace every 7500 miles or 12 months, whichever occurs first.
(22) Inspect air cleaner indicator replacement at every oil and filter change. Replace as necessary.
(23) On Bravada, replace every 50,000 miles. On all others, if used under severe conditions, replace every 15,000 miles. If used under normal conditions, replace every 100,000 miles.
(24) If used under severe conditions, replace every 3000 miles. If used under normal conditions, replace as indicated by CHANGE OIL SOON light, every 10,000 miles or every 12 months, whichever occurs first.
(25) If used under severe conditions, replace every 50,000 miles. If used under normal conditions, periodic replacement is not required.
(26) Inspect every 18,000 miles or 12 months, whichever occurs first. Replace as necessary.
(27) If used under severe conditions, replace every 3000 miles or 3 months, whichever occurs first. If used under normal conditions, replace as indicated by CHANGE OIL SOON light or every 7500 miles, whichever occurs first.
(28) Applies to 3.0L engine only.
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