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.
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HOMESERVICE MANUALSBUICK1985CENTURY V6-231 3.8LREPAIR AND DIAGNOSISMAINTENANCESERVICE INTERVALSROUTINE SERVICEAT EACH OIL CHANGE
1985 Buick Century V6-231 3.8L
At Each Oil Change
1985 Buick Century V6-231 3.8LSECTION At Each Oil Change
Automatic Transmission Fluid Level (if equipped)
Maintain level within operating range on the oil level indicator.
Manual Transmission (if equipped)
Check fluid level and add as required.
Manual Or Automatic Transaxle (if equipped)
Check the transaxle fluid level and add the proper fluid as required.
Steering And Suspension Inspection
Inspect front and rear suspension and steering system for damaged, loose or missing parts, signs of wear or lack of lubrication. Inspect power steering lines and hoses for proper hookup, binding, leaks, cracks, chafing, etc.
Exhaust System Inspection
Inspect complete system, including catalytic converter. Inspect body near the exhaust system. Look for broken, damaged, missing or out-of-position parts as well as open seams, holes, loose connections and other conditions which could cause a heat buildup in the floor pan or could let exhaust fumes seep into the trunk or passenger compartment. Check heat shields. Tighten connections or replace parts as necessary.
Throttle Linkage Inspection
Inspect the cable/linkage for interference, binding, damaged or missing parts. Replace or repair as necessary.
Drive Belt
Inspect drive belt(s) for cracks, fraying, wear and proper tension. Adjust or replace drive belt(s) as needed.
Rear Axle Assembly (if equipped)
Check fluid level and add if needed. To check or add fluid, hoist vehicle at suspension contact points. Keep vehicle level. Clean dirt or foreign material from around filler plug opening before removing the filler plug. Maintain fluid level from flush with bottom of opening to no lower than 6 mm (1/4 inch) below opening.
If the vehicle is used to pull a trailer, change lubricant every oil change in either type differential.
Limited slip differentials should have fluid drained and refilled at the first oil change. Be sure to add limited slip additive.
Power Antenna (if equipped)
Clean and then lubricate the power antenna mast.
Maintain level within operating range on the oil level indicator.
Manual Transmission (if equipped)
Check fluid level and add as required.
Manual Or Automatic Transaxle (if equipped)
Check the transaxle fluid level and add the proper fluid as required.
Steering And Suspension Inspection
Inspect front and rear suspension and steering system for damaged, loose or missing parts, signs of wear or lack of lubrication. Inspect power steering lines and hoses for proper hookup, binding, leaks, cracks, chafing, etc.
Exhaust System Inspection
Inspect complete system, including catalytic converter. Inspect body near the exhaust system. Look for broken, damaged, missing or out-of-position parts as well as open seams, holes, loose connections and other conditions which could cause a heat buildup in the floor pan or could let exhaust fumes seep into the trunk or passenger compartment. Check heat shields. Tighten connections or replace parts as necessary.
Throttle Linkage Inspection
Inspect the cable/linkage for interference, binding, damaged or missing parts. Replace or repair as necessary.
Drive Belt
Inspect drive belt(s) for cracks, fraying, wear and proper tension. Adjust or replace drive belt(s) as needed.
Rear Axle Assembly (if equipped)
Check fluid level and add if needed. To check or add fluid, hoist vehicle at suspension contact points. Keep vehicle level. Clean dirt or foreign material from around filler plug opening before removing the filler plug. Maintain fluid level from flush with bottom of opening to no lower than 6 mm (1/4 inch) below opening.
If the vehicle is used to pull a trailer, change lubricant every oil change in either type differential.
Limited slip differentials should have fluid drained and refilled at the first oil change. Be sure to add limited slip additive.
Power Antenna (if equipped)
Clean and then lubricate the power antenna mast.
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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.