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 qt with filter); the Custom, 2D Coupe, 2.5 R, 3T40/MD9 takes 5W-30 (3.0 quarts qt with filter); the Custom, 2D Coupe, 3.3 N, 125C/MD9 takes 5W-30 (4.0 quarts qt with filter); the Custom, 2D Coupe, 3.3 N, 3T40/MD9 takes 5W-30 (4.0 quarts qt with filter); the Custom, 2D Coupe, 3.3 N, 440T4/ME9 takes 5W-30 (4.0 quarts qt with filter); the Custom, 2D Coupe, 3.3 N, 4T60/ME9 takes 5W-30 (4.0 quarts qt with filter); the Custom, 4D Sedan, 2.5 R, 125C/MD9 takes 5W-30 (3.0 quarts qt with filter); the Custom, 4D Sedan, 2.5 R, 3T40/MD9 takes 5W-30 (3.0 quarts qt with filter); the Custom, 4D Sedan, 3.3 N, 125C/MD9 takes 5W-30 (4.0 quarts qt with filter); the Custom, 4D Sedan, 3.3 N, 3T40/MD9 takes 5W-30 (4.0 quarts qt with filter); the Custom, 4D Sedan, 3.3 N, 440T4/ME9 takes 5W-30 (4.0 quarts qt with filter); the Custom, 4D Sedan, 3.3 N, 4T60/ME9 takes 5W-30 (4.0 quarts qt with filter); the Custom, 4D Wagon, 2.5 R, 125C/MD9 takes 5W-30 (3.0 quarts qt with filter); the Custom, 4D Wagon, 2.5 R, 3T40/MD9 takes 5W-30 (3.0 quarts qt with filter); the Custom, 4D Wagon, 3.3 N, 440T4/ME9 takes 5W-30 (4.0 quarts qt with filter); the Custom, 4D Wagon, 3.3 N, 4T60/ME9 takes 5W-30 (4.0 quarts qt with filter); the Limited, 4D Sedan, 2.5 R, 125C/MD9 takes 5W-30 (3.0 quarts qt with filter); the Limited, 4D Sedan, 2.5 R, 3T40/MD9 takes 5W-30 (3.0 quarts qt with filter); the Limited, 4D Sedan, 3.3 N, 440T4/ME9 takes 5W-30 (4.0 quarts qt with filter); the Limited, 4D Sedan, 3.3 N, 4T60/ME9 takes 5W-30 (4.0 quarts qt with filter); the Limited, 4D Wagon, 2.5 R, 125C/MD9 takes 5W-30 (3.0 quarts qt with filter); the Limited, 4D Wagon, 2.5 R, 3T40/MD9 takes 5W-30 (3.0 quarts qt with filter); the Limited, 4D Wagon, 3.3 N, 440T4/ME9 takes 5W-30 (4.0 quarts qt with filter); the Limited, 4D Wagon, 3.3 N, 4T60/ME9 takes 5W-30 (4.0 quarts qt 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. | — | — |
More factory specs & repair guides for your Century
🛞 1990 Buick Century Tire Size & Pressure →🌧️ 1990 Buick Century Wiper Blade Sizes →💡 1990 Buick Century Light Bulb Sizes →📖 1990 Buick Century Factory Service Manual →All fluid capacities (transmission, coolant, brakes)Powered by factory manual data from our partner network 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.
What is the oil capacity of a 1990 Buick Century?
Oil 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.
How often should I change the oil in my 1990 Buick Century?
Most 1990 Buick Century owners follow a 5,000–7,500 mile interval with conventional oil, or up to 10,000 miles with full synthetic. Always check the oil life monitor if equipped, and consult your owner's manual — Buick recommends intervals based on driving conditions, not just mileage.
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.