Quick Summary
Looking for the correct oil type for your 1991 Buick CENTURY? According to factory specs, the 2.5L 4 -cyl Engine Code [R] R requires 10W-30 viscosity oil. Using the right oil capacity of 4.5 quarts ensures engine longevity and fuel efficiency.
๐ข๏ธ 2.5L 4 -cyl Engine Code [R] R Most Common
Verified Data
Capacity
4.5 quart
Viscosity
10W-30
๐ข๏ธ 3.3L 6 -cyl Engine Code [N] N
Verified Data
Capacity
4.5 QUART
Viscosity
10W-30
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Recommended Maintenance Products
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Oil Filter
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Drain Plug Gasket
Replace every oil change - don't reuse!
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Oil Drain Pan
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No-spill oil pouring
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Mechanic Gloves
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Common Trouble Codes for 1991 Buick CENTURY
Get vehicle-specific repair guides for these codes