GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Chevrolet 🢒 1998 🢒 Astro - 4WD 🢒 General Information 🢒 Maintenance and Lubrication 🢒 Maintenance Schedule - Long Trip/Highway

Perform the services shown in this schedule up to 166 000 km (100,000 miles) and after 166 000 km (100,000 miles) at the same intervals.

Perform the services shown in this schedule up to 240 000 km (150,000 miles) and after 240 000 km (150,000 miles) at the same intervals.

12 500 km (7,500 miles)

    • Change the engine oil and the filter (or every 12 months, whichever occurs first). An Emission Control Service *.
    • Lubricate the following chassis components (or every 12 months, whichever occurs first):

       Important:  Do not lubricate the ball joints unless the ball joint temperature is -12°C (10°F) or higher.

       - The front suspension
       - The steering linkage
       - The transmission shift linkage
       - The parking brake cable guides
       - The rear driveline center splines
       - The brake pedal springs
    • Check the front/rear axle fluid level. Add fluid as needed.
    • Check the constant velocity joints and the axle seals for leaks.
    • Rotate the tires.

25 000 km (15,000 miles)

    • Change the engine oil and the filter (or every 12 months, whichever occurs first). An Emission Control Service *.
    • Lubricate the following chassis components (or every 12 months, whichever occurs first):

       Important:  Do not lubricate the ball joints unless the ball joint temperature is -12°C (10°F) or higher.

       - The front suspension
       - The steering linkage
       - The transmission shift linkage
       - The parking brake cable guides
       - The rear driveline center splines
       - The brake pedal springs
    • Change the automatic transmission fluid and filter if the vehicle is driven under one or more of the following (severe service conditions):
       - In heavy city traffic where the outside temperature regularly reaches 90°F (32°C) or higher.
       - In hilly or mountainous terrain
       - When doing frequent trailer towing
       - Uses such as found in taxi, police, or delivery service. If you do not use your vehicle under any of these conditions, the fluid and filter change should be changed every 83 000 km (50,000 miles).
    • Check the front/rear axle fluid level. Add fluid as needed.
    • Check the constant velocity joints and the axle seals for leaks.
    • Rotate the tires.

37 500 km (22,500 miles)

    • Change the engine oil and the filter (or every 12 months, whichever occurs first). An Emission Control Service *.
    • Lubricate the following chassis components (or every 12 months, whichever occurs first):

       Important:  Do not lubricate the ball joints unless the ball joint temperature is -12°C (10°F) or higher.

       - The front suspension
       - The steering linkage
       - The transmission shift linkage
       - The parking brake cable guides
       - The rear driveline center splines
       - The brake pedal springs
    • Check the front/rear axle fluid level. Add fluid as needed.
    • Check the constant velocity joints and the axle seals for leaks.
    • Rotate the tires.

50 000 km (30,000 miles)

    • Change the engine oil and the filter (or every 12 months, whichever occurs first). An Emission Control Service *.
    • Lubricate the following chassis components (or every 12 months, whichever occurs first):

       Important:  Do not lubricate the ball joints unless the ball joint temperature is -12°C (10°F) or higher.

       - The front suspension
       - The steering linkage
       - The transmission shift linkage
       - The parking brake cable guides
       - The rear driveline center splines
       - The brake pedal springs
    • Change the automatic transmission fluid and the filter (severe service conditions).
    • Check the front/rear axle fluid level. Add fluid as needed.
    • Check the constant velocity joints and the axle seals for leaks.
    • Rotate the tires.
    • Clean and repack the front wheel bearings (RWD only) (or at each brake relining, whichever occurs first).
    • Replace the air cleaner filter. An Emission Control Service *.
    • Replace the fuel filter. An Emission Control Service *.

62 500 km (37,500 miles)

    • Change the engine oil and the filter (or every 12 months, whichever occurs first). An Emission Control Service *.
    • Lubricate the following chassis components (or every 12 months, whichever occurs first):

       Important:  Do not lubricate the ball joints unless the ball joint temperature is -12°C (10°F) or higher.

       - The front suspension
       - The steering linkage
       - The transmission shift linkage
       - The parking brake cable guides
       - The rear driveline center splines
       - The brake pedal springs
    • Check the front/rear axle fluid level. Add fluid as needed.
    • Check the constant velocity joints and the axle seals for leaks.
    • Rotate the tires.

75 000 km (45,000 miles)

    • Change the engine oil and the filter (or every 12 months, whichever occurs first). An Emission Control Service *.
    • Lubricate the following chassis components (or every 12 months, whichever occurs first):

       Important:  Do not lubricate the ball joints unless the ball joint temperature is -12°C (10°F) or higher.

       - The front suspension
       - The steering linkage
       - The transmission shift linkage
       - The parking brake cable guides
       - The rear driveline center splines
       - The brake pedal springs
    • Change the automatic transmission fluid and the filter (severe service conditions)
    • Check the front/rear axle fluid level. Add fluid as needed.
    • Check the constant velocity joints and the axle seals for leaks.
    • Rotate the tires.

83 000 km (50,000 miles)

Change the automatic transmission fluid and the filter (non-severe service conditions).

87 500 km (52,500 miles)

    • Change the engine oil and the filter (or every 12 months, whichever occurs first). An Emission Control Service *.
    • Lubricate the following chassis components (or every 12 months, whichever occurs first):

       Important:  Do not lubricate the ball joints unless the ball joint temperature is -12°C (10°F) or higher.

       - The front suspension
       - The steering linkage
       - The transmission shift linkage
       - The parking brake cable guides
       - The rear driveline center splines
       - The brake pedal springs
    • Check the front/rear axle fluid level. Add fluid as needed.
    • Check the constant velocity joints and the axle seals for leaks.
    • Rotate the tires.

100 000 km (60,000 miles)

    • Change the engine oil and the filter (or every 12 months, whichever occurs first). An Emission Control Service *.
    • Lubricate the following chassis components (or every 12 months, whichever occurs first):

       Important:  Do not lubricate the ball joints unless the ball joint temperature is -12°C (10°F) or higher.

       - The front suspension
       - The steering linkage
       - The transmission shift linkage
       - The parking brake cable guides
       - The rear driveline center splines
       - The brake pedal springs
    • Change the automatic transmission fluid and the filter (severe service conditions).
    • Check the front/rear axle fluid level. Add fluid as needed.
    • Check the constant velocity joints and the axle seals for leaks.
    • Rotate the tires.
    • Clean and repack the front wheel bearings (RWD only) (or at each brake relining, whichever occurs first).
    • Inspect the engine drive belt. An Emission Control Service *.
    • Replace the air cleaner filter. An Emission Control Service *.
    • Replace the fuel filter. An Emission Control Service *.
    • Inspect the following components for damage or leaks. Replace the parts as needed. An Emission Control Service *.
       - Fuel tank
       - Fuel cap
       - Fuel lines
       - Fuel cap gasket

112 500 km (67,500 miles)

    • Change the engine oil and the filter (or every 12 months, whichever occurs first). An Emission Control Service *.
    • Lubricate the following chassis components (or every 12 months, whichever occurs first):

       Important:  Do not lubricate the ball joints unless the ball joint temperature is -12°C (10°F) or higher.

       - The front suspension
       - The steering linkage
       - The transmission shift linkage
       - The parking brake cable guides
       - The rear driveline center splines
       - The brake pedal springs
    • Check the front/rear axle fluid level. Add fluid as needed.
    • Check the constant velocity joints and the axle seals for leaks.
    • Rotate the tires.

125 000 km (75,000 miles)

    • Change the engine oil and the filter (or every 12 months, whichever occurs first). An Emission Control Service *.
    • Lubricate the following chassis components (or every 12 months, whichever occurs first):

       Important:  Do not lubricate the ball joints unless the ball joint temperature is -12°C (10°F) or higher.

       - The front suspension
       - The steering linkage
       - The transmission shift linkage
       - The parking brake cable guides
       - The rear driveline center splines
       - The brake pedal springs
    • Change the automatic transmission fluid and the filter (severe service conditions).
    • Check the front/rear axle fluid level. Add fluid as needed.
    • Check the constant velocity joints and the axle seals for leaks.
    • Rotate the tires.

137 500 km (82,500 miles)

    • Change the engine oil and the filter (or every 12 months, whichever occurs first). An Emission Control Service *.
    • Lubricate the following chassis components (or every 12 months, whichever occurs first):

       Important:  Do not lubricate the ball joints unless the ball joint temperature is -12°C (10°F) or higher.

       - The front suspension
       - The steering linkage
       - The transmission shift linkage
       - The parking brake cable guides
       - The rear driveline center splines
       - The brake pedal springs
    • Check the front/rear axle fluid level. Add fluid as needed.
    • Check the constant velocity joints and the axle seals for leaks.
    • Rotate the tires.

150 000 km (90,000 miles)

    • Change the engine oil and the filter (or every 12 months, whichever occurs first). An Emission Control Service *.
    • Lubricate the following chassis components (or every 12 months, whichever occurs first):

       Important:  Do not lubricate the ball joints unless the ball joint temperature is -12°C (10°F) or higher.

       - The front suspension
       - The steering linkage
       - The transmission shift linkage
       - The parking brake cable guides
       - The rear driveline center splines
       - The brake pedal springs
    • Change the automatic transmission fluid and the filter (severe service conditions).
    • Check the front/rear axle fluid level. Add fluid as needed.
    • Check the constant velocity joints and the axle seals for leaks.
    • Rotate the tires.
    • Clean and repack the front wheel bearings (RWD only) (or at each brake relining, whichever occurs first).
    • Replace the air cleaner filter. An Emission Control Service *.
    • Replace the fuel filter. An Emission Control Service *.

162 500 km (97,500 miles)

    • Change the engine oil and the filter (or every 12 months, whichever occurs first). An Emission Control Service *.
    • Lubricate the following chassis components (or every 12 months, whichever occurs first):

       Important:  Do not lubricate the ball joints unless the ball joint temperature is -12°C (10°F) or higher.

       - The front suspension
       - The steering linkage
       - The transmission shift linkage
       - The parking brake cable guides
       - The rear driveline center splines
       - The brake pedal springs
    • Check the front/rear axle fluid level. Add fluid as needed.
    • Check the constant velocity joints and the axle seals for leaks.
    • Rotate the tires.

166 000 km (100,000 miles)

    • Inspect the spark plug wires.
    • Replace the spark plugs. An Emission Control Service *.
    • Inspect the positive crankcase ventilation (PCV) valve.
    • Change the automatic transmission fluid and the filter (non-severe service conditions).

240 000 km (150,000 miles)

    • Drain, flush and refill the cooling system (or every 60 months since the last service, whichever comes first). Refer to Fluid and Lubricant Recommendations .
    • Inspect the hoses.
    • Clean the following components. An Emission Control Service *.
       - The radiator
       - The condenser
       - The pressure cap
       - The neck
    • Change the automatic transmission fluid and the filter (severe and non-severe service conditions).

Footnotes

*The California Air Resources Board has determined that the failure to perform this maintenance item will not nullify the emission warranty. The California Air Resources Board has also determined that the failure to perform this maintenance item will not limit the recall liability prior to the completion of the vehicle useful life. GM, however, urges that all recommended maintenance be recorded.

Drive Axle Service:

    • The Locking Differential
        Drain the fluid and refill the fluid at the first engine oil change. At subsequent oil changes, inspect the fluid level and add fluid as necessary. Drain the fluid and refill the fluid every 25 000 km (15,000 miles) if the vehicle is performing either of the following actions:
       - Driving in dusty areas
       - Towing a trailer
    • The Standard Differential
        Inspect the fluid level and add fluid as necessary at every oil change. Drain the fluid and refill the fluid every 25 000 km (15,000 miles) if the vehicle is performing either of the following actions:
       - Driving in dusty areas
       - Towing a trailer
    • Heavy-duty or off-road use may require more frequent lubrication.