1989 Buick Century Oil Type & Capacity
The 1989 Buick Century takes 5W-30 motor oil — 3.0 quarts with a filter change, per the factory service manual.
Factory-spec answer
5W-30 — 3.0 quarts with filter
Oil capacity by engine
| Engine | Oil Type (viscosity) | Capacity w/ Filter | Capacity w/o Filter | Notes |
|---|---|---|---|---|
| Custom, 2D Coupe, 2.5 R — 2.5L Eng | SAE 5W-30 (Preferred) (Below -20Deg.F to Above 100Deg.F), 10W-30 (0Deg.F to Above 100Deg.F) | 3.00 QTS. | — | — |
| Custom, 4D Sedan, 2.5 R — 2.5L Eng | SAE 5W-30 (Preferred) (Below -20Deg.F to Above 100Deg.F), 10W-30 (0Deg.F to Above 100Deg.F) | 3.00 QTS. | — | — |
| Custom, 4D Wagon, 2.5 R — 2.5L Eng | SAE 5W-30 (Preferred) (Below -20Deg.F to Above 100Deg.F), 10W-30 (0Deg.F to Above 100Deg.F) | 3.00 QTS. | — | — |
| Estate Wagon, 2.5 R — 2.5L Eng | SAE 5W-30 (Preferred) (Below -20Deg.F to Above 100Deg.F), 10W-30 (0Deg.F to Above 100Deg.F) | 3.00 QTS. | — | — |
| Limited, 2.5 R — 2.5L Eng | SAE 5W-30 (Preferred) (Below -20Deg.F to Above 100Deg.F), 10W-30 (0Deg.F to Above 100Deg.F) | 3.00 QTS. | — | — |
Buy the right oil
Buy 5W-30 motor oil on Amazon1989 Buick Century oil filter on AmazonAs an Amazon Associate we earn from qualifying purchases made through these links.
More specs & repair guides for your Century
1989 Buick Century factory service manualAll fluid capacities (transmission, coolant, brakes)Powered by factory manual data from our partner site AllOEMManuals.com.
Coolant capacity
9.5 quarts (8.99 L) — 50/50 mixture of Ethylene Glycol Base Antifreeze and water. GM Specification 1825-M.
Frequently asked questions
What type of oil does a 1989 Buick Century take?
The 1989 Buick Century takes 5W-30 motor oil (SAE 5W-30 (Preferred) (Below -20Deg.F to Above 100Deg.F), 10W-30 (0Deg.F to Above 100Deg.F)), per the factory service manual.
How much oil does a 1989 Buick Century take?
The 1989 Buick Century holds 3.0 quarts with a filter change.
Can I use synthetic oil in my 1989 Buick Century?
Yes. 5W-30 is widely available as a full synthetic, and synthetic is safe (often recommended) for the 1989 Buick Century. What matters most is matching the factory viscosity and specification, then changing the oil and filter on schedule.