1990 Buick Regal Oil Type & Capacity: 5W-30 (4.0 quarts)
The 1990 Buick Regal takes 5W-30 motor oil — 4.0 quarts with a filter change, per the factory service manual.
Factory-spec answer
5W-30 — 4.0 quarts with filter
Oil capacity by engine
| Engine | Oil Type (viscosity) | Capacity w/ Filter | Capacity w/o Filter | Notes |
|---|---|---|---|---|
| Custom, 3.1 T, 440T4/ME9 — 3.1L Eng | API - SAE 5W-30 (Preferred), 10W-30 (Above 0Deg.F) | 4.00 QTS. | — | — |
| Custom, 3.1 T, 4T60/ME9 — 3.1L Eng | API - SAE 5W-30 (Preferred), 10W-30 (Above 0Deg.F) | 4.00 QTS. | — | — |
| Custom, 3.8 L, 440T4/ME9 — 3.8L Eng | API - SAE 5W-30 (Below 0Deg.F to 60Deg.F), 10W-30 (Preferred) (0Deg.F to Above 100Deg.F) | 4.00 QTS. | — | — |
| Custom, 3.8 L, 4T60/ME9 — 3.8L Eng | API - SAE 5W-30 (Below 0Deg.F to 60Deg.F), 10W-30 (Preferred) (0Deg.F to Above 100Deg.F) | 4.00 QTS. | — | — |
| Gran Sport, 440T4/ME9 — 3.8L Eng | API - SAE 5W-30 (Below 0Deg.F to 60Deg.F), 10W-30 (Preferred) (0Deg.F to Above 100Deg.F) | 4.00 QTS. | — | — |
| Gran Sport, 4T60/ME9 — 3.8L Eng | API - SAE 5W-30 (Below 0Deg.F to 60Deg.F), 10W-30 (Preferred) (0Deg.F to Above 100Deg.F) | 4.00 QTS. | — | — |
| Limited, 3.1 T, 440T4/ME9 — 3.1L Eng | API - SAE 5W-30 (Preferred), 10W-30 (Above 0Deg.F) | 4.00 QTS. | — | — |
| Limited, 3.1 T, 4T60/ME9 — 3.1L Eng | API - SAE 5W-30 (Preferred), 10W-30 (Above 0Deg.F) | 4.00 QTS. | — | — |
| Limited, 3.8 L, 440T4/ME9 — 3.8L Eng | API - SAE 5W-30 (Below 0Deg.F to 60Deg.F), 10W-30 (Preferred) (0Deg.F to Above 100Deg.F) | 4.00 QTS. | — | — |
| Limited, 3.8 L, 4T60/ME9 — 3.8L Eng | API - SAE 5W-30 (Below 0Deg.F to 60Deg.F), 10W-30 (Preferred) (0Deg.F to Above 100Deg.F) | 4.00 QTS. | — | — |
More factory specs & repair guides for your Regal
🛞 1990 Buick Regal Tire Size & Pressure →🌧️ 1990 Buick Regal Wiper Blade Sizes →💡 1990 Buick Regal Light Bulb Sizes →📖 1990 Buick Regal Factory Service Manual →All fluid capacities (transmission, coolant, brakes)Powered by factory manual data from our partner network AllOEMManuals.com.
Coolant capacity
12.6 quarts (11.92 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 Regal take?
The 1990 Buick Regal takes 5W-30 motor oil (API - SAE 5W-30 (Preferred), 10W-30 (Above 0Deg.F)), per the factory service manual.
What is the oil capacity of a 1990 Buick Regal?
The 1990 Buick Regal oil capacity is 4.0 quarts with a filter change.
How often should I change the oil in my 1990 Buick Regal?
Most 1990 Buick Regal 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 Regal?
Yes. 5W-30 is widely available as a full synthetic, and synthetic is safe (often recommended) for the 1990 Buick Regal. What matters most is matching the factory viscosity and specification, then changing the oil and filter on schedule.