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 DIAGNOSISMAINTENANCESPECIFICATIONSCRANKCASE
1985 Buick Century V6-231 3.8L
Crankcase
1985 Buick Century V6-231 3.8LSECTION Crankcase
Diesel engine SG/CD(Motor Oil, API Service SG/CD)
Gasoline engine SG
CAPACITY, Refill:
Diesel, including filter
6-cyl 5.6 Liters 6.0 Quarts
8-cyl 6.6 Liters 7.0 Quarts
Gasoline
4-cyl. 2.5L 2.8 Liters 3.0 Quarts
Others 3.8 Liters 4.0 Quarts
Gasoline, capacity shown is without filter. When replacing filter, additional oil may be needed
Diesel Engine:
Above 32°F (0°C) 30*
0° to 60°F (-18° to 16°C) 15W-40
Below 60°F (16°C) 10W-30
Gasoline Engine:
Above 40°F (4°C) 30
Above 20°F (-7°C) 20W-20
Above 10°F (-12°C) 15W-40
Above 0°F (-18°C) 10W-30
Below 60°F (16°C) 5W-30‡
*30 is preferred above 32°F (0°C), especially for continuous duty driving
‡5W-30 may be used up to 100°F (38°C) in 4-cyl. & 2.8L V6 engines
RENDER: 1.0x
NO RELATED
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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.