1990 Buick Century Oil Type & Capacity
The 1990 Buick Century oil type depends on the engine: the Custom, 2D Coupe, 2.5 R, 125C/MD9 takes 5W-30 (3.0 quarts with filter); the Custom, 2D Coupe, 2.5 R, 3T40/MD9 takes 5W-30 (3.0 quarts with filter); the Custom, 2D Coupe, 3.3 N, 125C/MD9 takes 5W-30 (4.0 quarts with filter); the Custom, 2D Coupe, 3.3 N, 3T40/MD9 takes 5W-30 (4.0 quarts with filter); the Custom, 2D Coupe, 3.3 N, 440T4/ME9 takes 5W-30 (4.0 quarts with filter); the Custom, 2D Coupe, 3.3 N, 4T60/ME9 takes 5W-30 (4.0 quarts with filter); the Custom, 4D Sedan, 2.5 R, 125C/MD9 takes 5W-30 (3.0 quarts with filter); the Custom, 4D Sedan, 2.5 R, 3T40/MD9 takes 5W-30 (3.0 quarts with filter); the Custom, 4D Sedan, 3.3 N, 125C/MD9 takes 5W-30 (4.0 quarts with filter); the Custom, 4D Sedan, 3.3 N, 3T40/MD9 takes 5W-30 (4.0 quarts with filter); the Custom, 4D Sedan, 3.3 N, 440T4/ME9 takes 5W-30 (4.0 quarts with filter); the Custom, 4D Sedan, 3.3 N, 4T60/ME9 takes 5W-30 (4.0 quarts with filter); the Custom, 4D Wagon, 2.5 R, 125C/MD9 takes 5W-30 (3.0 quarts with filter); the Custom, 4D Wagon, 2.5 R, 3T40/MD9 takes 5W-30 (3.0 quarts with filter); the Custom, 4D Wagon, 3.3 N, 440T4/ME9 takes 5W-30 (4.0 quarts with filter); the Custom, 4D Wagon, 3.3 N, 4T60/ME9 takes 5W-30 (4.0 quarts with filter); the Limited, 4D Sedan, 2.5 R, 125C/MD9 takes 5W-30 (3.0 quarts with filter); the Limited, 4D Sedan, 2.5 R, 3T40/MD9 takes 5W-30 (3.0 quarts with filter); the Limited, 4D Sedan, 3.3 N, 440T4/ME9 takes 5W-30 (4.0 quarts with filter); the Limited, 4D Sedan, 3.3 N, 4T60/ME9 takes 5W-30 (4.0 quarts with filter); the Limited, 4D Wagon, 2.5 R, 125C/MD9 takes 5W-30 (3.0 quarts with filter); the Limited, 4D Wagon, 2.5 R, 3T40/MD9 takes 5W-30 (3.0 quarts with filter); the Limited, 4D Wagon, 3.3 N, 440T4/ME9 takes 5W-30 (4.0 quarts with filter); the Limited, 4D Wagon, 3.3 N, 4T60/ME9 takes 5W-30 (4.0 quarts with filter), per the factory service manual.
Factory-spec answer
It depends on the engine:
- Custom, 2D Coupe, 2.5 R, 125C/MD9: 5W-30, 3.0 quarts with filter
- Custom, 2D Coupe, 2.5 R, 3T40/MD9: 5W-30, 3.0 quarts with filter
- Custom, 2D Coupe, 3.3 N, 125C/MD9: 5W-30, 4.0 quarts with filter
- Custom, 2D Coupe, 3.3 N, 3T40/MD9: 5W-30, 4.0 quarts with filter
- Custom, 2D Coupe, 3.3 N, 440T4/ME9: 5W-30, 4.0 quarts with filter
- Custom, 2D Coupe, 3.3 N, 4T60/ME9: 5W-30, 4.0 quarts with filter
- Custom, 4D Sedan, 2.5 R, 125C/MD9: 5W-30, 3.0 quarts with filter
- Custom, 4D Sedan, 2.5 R, 3T40/MD9: 5W-30, 3.0 quarts with filter
- Custom, 4D Sedan, 3.3 N, 125C/MD9: 5W-30, 4.0 quarts with filter
- Custom, 4D Sedan, 3.3 N, 3T40/MD9: 5W-30, 4.0 quarts with filter
- Custom, 4D Sedan, 3.3 N, 440T4/ME9: 5W-30, 4.0 quarts with filter
- Custom, 4D Sedan, 3.3 N, 4T60/ME9: 5W-30, 4.0 quarts with filter
- Custom, 4D Wagon, 2.5 R, 125C/MD9: 5W-30, 3.0 quarts with filter
- Custom, 4D Wagon, 2.5 R, 3T40/MD9: 5W-30, 3.0 quarts with filter
- Custom, 4D Wagon, 3.3 N, 440T4/ME9: 5W-30, 4.0 quarts with filter
- Custom, 4D Wagon, 3.3 N, 4T60/ME9: 5W-30, 4.0 quarts with filter
- Limited, 4D Sedan, 2.5 R, 125C/MD9: 5W-30, 3.0 quarts with filter
- Limited, 4D Sedan, 2.5 R, 3T40/MD9: 5W-30, 3.0 quarts with filter
- Limited, 4D Sedan, 3.3 N, 440T4/ME9: 5W-30, 4.0 quarts with filter
- Limited, 4D Sedan, 3.3 N, 4T60/ME9: 5W-30, 4.0 quarts with filter
- Limited, 4D Wagon, 2.5 R, 125C/MD9: 5W-30, 3.0 quarts with filter
- Limited, 4D Wagon, 2.5 R, 3T40/MD9: 5W-30, 3.0 quarts with filter
- Limited, 4D Wagon, 3.3 N, 440T4/ME9: 5W-30, 4.0 quarts with filter
- Limited, 4D Wagon, 3.3 N, 4T60/ME9: 5W-30, 4.0 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, 125C/MD9 — 2.5L Eng | API - SAE 5W-30 (Preferred), 10W-30 (Above 0Deg.F) | 3.00 QTS. | — | — |
| Custom, 2D Coupe, 2.5 R, 3T40/MD9 — 2.5L Eng | API - SAE 5W-30 (Preferred), 10W-30 (Above 0Deg.F) | 3.00 QTS. | — | — |
| Custom, 2D Coupe, 3.3 N, 125C/MD9 — 3.3L Eng | API - SAE 5W-30 (Preferred), 10W-30 (Above 0Deg.F) | 4.00 QTS. | — | — |
| Custom, 2D Coupe, 3.3 N, 3T40/MD9 — 3.3L Eng | API - SAE 5W-30 (Preferred), 10W-30 (Above 0Deg.F) | 4.00 QTS. | — | — |
| Custom, 2D Coupe, 3.3 N, 440T4/ME9 — 3.3L Eng | API - SAE 5W-30 (Preferred), 10W-30 (Above 0Deg.F) | 4.00 QTS. | — | — |
| Custom, 2D Coupe, 3.3 N, 4T60/ME9 — 3.3L Eng | API - SAE 5W-30 (Preferred), 10W-30 (Above 0Deg.F) | 4.00 QTS. | — | — |
| Custom, 4D Sedan, 2.5 R, 125C/MD9 — 2.5L Eng | API - SAE 5W-30 (Preferred), 10W-30 (Above 0Deg.F) | 3.00 QTS. | — | — |
| Custom, 4D Sedan, 2.5 R, 3T40/MD9 — 2.5L Eng | API - SAE 5W-30 (Preferred), 10W-30 (Above 0Deg.F) | 3.00 QTS. | — | — |
| Custom, 4D Sedan, 3.3 N, 125C/MD9 — 3.3L Eng | API - SAE 5W-30 (Preferred), 10W-30 (Above 0Deg.F) | 4.00 QTS. | — | — |
| Custom, 4D Sedan, 3.3 N, 3T40/MD9 — 3.3L Eng | API - SAE 5W-30 (Preferred), 10W-30 (Above 0Deg.F) | 4.00 QTS. | — | — |
| Custom, 4D Sedan, 3.3 N, 440T4/ME9 — 3.3L Eng | API - SAE 5W-30 (Preferred), 10W-30 (Above 0Deg.F) | 4.00 QTS. | — | — |
| Custom, 4D Sedan, 3.3 N, 4T60/ME9 — 3.3L Eng | API - SAE 5W-30 (Preferred), 10W-30 (Above 0Deg.F) | 4.00 QTS. | — | — |
| Custom, 4D Wagon, 2.5 R, 125C/MD9 — 2.5L Eng | API - SAE 5W-30 (Preferred), 10W-30 (Above 0Deg.F) | 3.00 QTS. | — | — |
| Custom, 4D Wagon, 2.5 R, 3T40/MD9 — 2.5L Eng | API - SAE 5W-30 (Preferred), 10W-30 (Above 0Deg.F) | 3.00 QTS. | — | — |
| Custom, 4D Wagon, 3.3 N, 440T4/ME9 — 3.3L Eng | API - SAE 5W-30 (Preferred), 10W-30 (Above 0Deg.F) | 4.00 QTS. | — | — |
| Custom, 4D Wagon, 3.3 N, 4T60/ME9 — 3.3L Eng | API - SAE 5W-30 (Preferred), 10W-30 (Above 0Deg.F) | 4.00 QTS. | — | — |
| Limited, 4D Sedan, 2.5 R, 125C/MD9 — 2.5L Eng | API - SAE 5W-30 (Preferred), 10W-30 (Above 0Deg.F) | 3.00 QTS. | — | — |
| Limited, 4D Sedan, 2.5 R, 3T40/MD9 — 2.5L Eng | API - SAE 5W-30 (Preferred), 10W-30 (Above 0Deg.F) | 3.00 QTS. | — | — |
| Limited, 4D Sedan, 3.3 N, 440T4/ME9 — 3.3L Eng | API - SAE 5W-30 (Preferred), 10W-30 (Above 0Deg.F) | 4.00 QTS. | — | — |
| Limited, 4D Sedan, 3.3 N, 4T60/ME9 — 3.3L Eng | API - SAE 5W-30 (Preferred), 10W-30 (Above 0Deg.F) | 4.00 QTS. | — | — |
| Limited, 4D Wagon, 2.5 R, 125C/MD9 — 2.5L Eng | API - SAE 5W-30 (Preferred), 10W-30 (Above 0Deg.F) | 3.00 QTS. | — | — |
| Limited, 4D Wagon, 2.5 R, 3T40/MD9 — 2.5L Eng | API - SAE 5W-30 (Preferred), 10W-30 (Above 0Deg.F) | 3.00 QTS. | — | — |
| Limited, 4D Wagon, 3.3 N, 440T4/ME9 — 3.3L Eng | API - SAE 5W-30 (Preferred), 10W-30 (Above 0Deg.F) | 4.00 QTS. | — | — |
| Limited, 4D Wagon, 3.3 N, 4T60/ME9 — 3.3L Eng | API - SAE 5W-30 (Preferred), 10W-30 (Above 0Deg.F) | 4.00 QTS. | — | — |
Buy the right oil
Buy 5W-30 motor oil on Amazon1990 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
1990 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 1990 Buick Century take?
It depends on the engine: Custom, 2D Coupe, 2.5 R, 125C/MD9 uses 5W-30; Custom, 2D Coupe, 2.5 R, 3T40/MD9 uses 5W-30; Custom, 2D Coupe, 3.3 N, 125C/MD9 uses 5W-30; Custom, 2D Coupe, 3.3 N, 3T40/MD9 uses 5W-30; Custom, 2D Coupe, 3.3 N, 440T4/ME9 uses 5W-30; Custom, 2D Coupe, 3.3 N, 4T60/ME9 uses 5W-30; Custom, 4D Sedan, 2.5 R, 125C/MD9 uses 5W-30; Custom, 4D Sedan, 2.5 R, 3T40/MD9 uses 5W-30; Custom, 4D Sedan, 3.3 N, 125C/MD9 uses 5W-30; Custom, 4D Sedan, 3.3 N, 3T40/MD9 uses 5W-30; Custom, 4D Sedan, 3.3 N, 440T4/ME9 uses 5W-30; Custom, 4D Sedan, 3.3 N, 4T60/ME9 uses 5W-30; Custom, 4D Wagon, 2.5 R, 125C/MD9 uses 5W-30; Custom, 4D Wagon, 2.5 R, 3T40/MD9 uses 5W-30; Custom, 4D Wagon, 3.3 N, 440T4/ME9 uses 5W-30; Custom, 4D Wagon, 3.3 N, 4T60/ME9 uses 5W-30; Limited, 4D Sedan, 2.5 R, 125C/MD9 uses 5W-30; Limited, 4D Sedan, 2.5 R, 3T40/MD9 uses 5W-30; Limited, 4D Sedan, 3.3 N, 440T4/ME9 uses 5W-30; Limited, 4D Sedan, 3.3 N, 4T60/ME9 uses 5W-30; Limited, 4D Wagon, 2.5 R, 125C/MD9 uses 5W-30; Limited, 4D Wagon, 2.5 R, 3T40/MD9 uses 5W-30; Limited, 4D Wagon, 3.3 N, 440T4/ME9 uses 5W-30; Limited, 4D Wagon, 3.3 N, 4T60/ME9 uses 5W-30.
How much oil does a 1990 Buick Century take?
Capacity depends on the engine: Custom, 2D Coupe, 2.5 R, 125C/MD9 holds 3.0 quarts with filter; Custom, 2D Coupe, 2.5 R, 3T40/MD9 holds 3.0 quarts with filter; Custom, 2D Coupe, 3.3 N, 125C/MD9 holds 4.0 quarts with filter; Custom, 2D Coupe, 3.3 N, 3T40/MD9 holds 4.0 quarts with filter; Custom, 2D Coupe, 3.3 N, 440T4/ME9 holds 4.0 quarts with filter; Custom, 2D Coupe, 3.3 N, 4T60/ME9 holds 4.0 quarts with filter; Custom, 4D Sedan, 2.5 R, 125C/MD9 holds 3.0 quarts with filter; Custom, 4D Sedan, 2.5 R, 3T40/MD9 holds 3.0 quarts with filter; Custom, 4D Sedan, 3.3 N, 125C/MD9 holds 4.0 quarts with filter; Custom, 4D Sedan, 3.3 N, 3T40/MD9 holds 4.0 quarts with filter; Custom, 4D Sedan, 3.3 N, 440T4/ME9 holds 4.0 quarts with filter; Custom, 4D Sedan, 3.3 N, 4T60/ME9 holds 4.0 quarts with filter; Custom, 4D Wagon, 2.5 R, 125C/MD9 holds 3.0 quarts with filter; Custom, 4D Wagon, 2.5 R, 3T40/MD9 holds 3.0 quarts with filter; Custom, 4D Wagon, 3.3 N, 440T4/ME9 holds 4.0 quarts with filter; Custom, 4D Wagon, 3.3 N, 4T60/ME9 holds 4.0 quarts with filter; Limited, 4D Sedan, 2.5 R, 125C/MD9 holds 3.0 quarts with filter; Limited, 4D Sedan, 2.5 R, 3T40/MD9 holds 3.0 quarts with filter; Limited, 4D Sedan, 3.3 N, 440T4/ME9 holds 4.0 quarts with filter; Limited, 4D Sedan, 3.3 N, 4T60/ME9 holds 4.0 quarts with filter; Limited, 4D Wagon, 2.5 R, 125C/MD9 holds 3.0 quarts with filter; Limited, 4D Wagon, 2.5 R, 3T40/MD9 holds 3.0 quarts with filter; Limited, 4D Wagon, 3.3 N, 440T4/ME9 holds 4.0 quarts with filter; Limited, 4D Wagon, 3.3 N, 4T60/ME9 holds 4.0 quarts with filter.
Can I use synthetic oil in my 1990 Buick Century?
Yes. 5W-30 is widely available as a full synthetic, and synthetic is safe (often recommended) for the 1990 Buick Century. What matters most is matching the factory viscosity and specification, then changing the oil and filter on schedule.