GMC 1999 Savana Van Owner's Manual page 344

Long Trip/Highway Scheduled Maintenance -- Gasoline Engines
90,000 Miles (150 000 km) (Continued)
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Vehicles With GVWR Above 10,000 lbs. Only: Inspect shields for damage or
looseness. Adjust or replace as required.
This is a Noise Emission Control Service. Applicable only to vehicles sold in
the United States.
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Rotate tires. See "Tire Inspection and Rotation" in the Index for proper
rotation pattern and additional information. (See footnote +.)
97,500 Miles (162 500 km)
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Change engine oil and filter (or every 12 months, whichever occurs first).
An Emission Control Service.
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Lubricate chassis components (or every 12 months, whichever occurs first).
(See footnote #.)
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Check axle fluid level and add fluid as needed. (See footnote **.)
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Rotate tires. See "Tire Inspection and Rotation" in the Index for proper
rotation pattern and additional information. (See footnote +.)
100,000 Miles (166 000 km)
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Inspect spark plug wires. An Emission Control Service.
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Replace spark plugs. An Emission Control Service.
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