Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
1998 Oldsmobile Aurora V8-4.0L VIN CFACTORY OEM SERVICE PROCEDURE
Cooling System Service
COOLING SYSTEM SERVICE
^ Drain, flush and refill the cooling system every 240 000 km (150,000 miles) or every 60 months, whichever occurs first.
^ Inspect the hoses.
^ Clean the radiator, condenser, pressure cap and the neck.
^ Pressure test the cooling system.
Engine Type
A 50/50 mixture of clean water (preferably distilled) and use only GM Goodwrench(R) DEX-COOL(R) or Havoline(R) DEX-COOL(R) (orange-colored, silicate-free) coolant, conforming to GM Specification 6277M.
CAUTIONS:
^ The use of sealing pellets (or similar compounds) in the coolant system is NOT recommended.The use of sealing pellets may restrict the flow of coolant through the throttle body or other engine cooling system components.
^ If silicate coolant is added to the cooling system, premature engine, heater core or radiator corrosion may result. In addition, the coolant will require change SOONER, at 50 000 km (30,000 miles) or 24 months.
This is an emission control service, refer to Emissions Control Service.
^ Drain, flush and refill the cooling system every 240 000 km (150,000 miles) or every 60 months, whichever occurs first.
^ Inspect the hoses.
^ Clean the radiator, condenser, pressure cap and the neck.
^ Pressure test the cooling system.
Engine Type
A 50/50 mixture of clean water (preferably distilled) and use only GM Goodwrench(R) DEX-COOL(R) or Havoline(R) DEX-COOL(R) (orange-colored, silicate-free) coolant, conforming to GM Specification 6277M.
CAUTIONS:
^ The use of sealing pellets (or similar compounds) in the coolant system is NOT recommended.The use of sealing pellets may restrict the flow of coolant through the throttle body or other engine cooling system components.
^ If silicate coolant is added to the cooling system, premature engine, heater core or radiator corrosion may result. In addition, the coolant will require change SOONER, at 50 000 km (30,000 miles) or 24 months.
This is an emission control service, refer to Emissions Control Service.
Factory Service Tools
Use the Manual With the Right Hardware
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.
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