1991 Buick Regal Oil Type & Capacity
The 1991 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, 2D Coupe, 3.1 T, 440T4/ME9 — 3.1L Eng | API - SAE 5W-30 (Below -20Deg.F to 60Deg.F), 10W-30 (Preferred) (0Deg.F to Above 100Deg.F) | 4.00 QTS. | — | — |
| Custom, 2D Coupe, 3.1 T, 4T60/ME9 — 3.1L Eng | API - SAE 5W-30 (Below -20Deg.F to 60Deg.F), 10W-30 (Preferred) (0Deg.F to Above 100Deg.F) | 4.00 QTS. | — | — |
| Custom, 2D Coupe, 3.8 L, 440T4/ME9 — 3.8L Eng | API - SAE 5W-30 (Below -20Deg.F to 60Deg.F), 10W-30 (Preferred) (0Deg.F to Above 100Deg.F) | 4.00 QTS. | — | — |
| Custom, 2D Coupe, 3.8 L, 4T60/ME9 — 3.8L Eng | API - SAE 5W-30 (Below -20Deg.F to 60Deg.F), 10W-30 (Preferred) (0Deg.F to Above 100Deg.F) | 4.00 QTS. | — | — |
| Custom, 4D Sedan, 3.1 T, 440T4/ME9 — 3.1L Eng | API - SAE 5W-30 (Below -20Deg.F to 60Deg.F), 10W-30 (Preferred) (0Deg.F to Above 100Deg.F) | 4.00 QTS. | — | — |
| Custom, 4D Sedan, 3.1 T, 4T60/ME9 — 3.1L Eng | API - SAE 5W-30 (Below -20Deg.F to 60Deg.F), 10W-30 (Preferred) (0Deg.F to Above 100Deg.F) | 4.00 QTS. | — | — |
| Custom, 4D Sedan, 3.8 L, 440T4/ME9 — 3.8L Eng | API - SAE 5W-30 (Below -20Deg.F to 60Deg.F), 10W-30 (Preferred) (0Deg.F to Above 100Deg.F) | 4.00 QTS. | — | — |
| Custom, 4D Sedan, 3.8 L, 4T60/ME9 — 3.8L Eng | API - SAE 5W-30 (Below -20Deg.F to 60Deg.F), 10W-30 (Preferred) (0Deg.F to Above 100Deg.F) | 4.00 QTS. | — | — |
| Gran Sport, 2D Coupe, 440T4/ME9 — 3.8L Eng | API - SAE 5W-30 (Below -20Deg.F to 60Deg.F), 10W-30 (Preferred) (0Deg.F to Above 100Deg.F) | 4.00 QTS. | — | — |
| Gran Sport, 2D Coupe, 4T60/ME9 — 3.8L Eng | API - SAE 5W-30 (Below -20Deg.F to 60Deg.F), 10W-30 (Preferred) (0Deg.F to Above 100Deg.F) | 4.00 QTS. | — | — |
| Gran Sport, 4D Sedan, 440T4/ME9 — 3.8L Eng | API - SAE 5W-30 (Below -20Deg.F to 60Deg.F), 10W-30 (Preferred) (0Deg.F to Above 100Deg.F) | 4.00 QTS. | — | — |
| Gran Sport, 4D Sedan, 4T60/ME9 — 3.8L Eng | API - SAE 5W-30 (Below -20Deg.F to 60Deg.F), 10W-30 (Preferred) (0Deg.F to Above 100Deg.F) | 4.00 QTS. | — | — |
| Limited, 2D Coupe, 3.1 T, 440T4/ME9 — 3.1L Eng | API - SAE 5W-30 (Below -20Deg.F to 60Deg.F), 10W-30 (Preferred) (0Deg.F to Above 100Deg.F) | 4.00 QTS. | — | — |
| Limited, 2D Coupe, 3.1 T, 4T60/ME9 — 3.1L Eng | API - SAE 5W-30 (Below -20Deg.F to 60Deg.F), 10W-30 (Preferred) (0Deg.F to Above 100Deg.F) | 4.00 QTS. | — | — |
| Limited, 2D Coupe, 3.8 L, 440T4/ME9 — 3.8L Eng | API - SAE 5W-30 (Below -20Deg.F to 60Deg.F), 10W-30 (Preferred) (0Deg.F to Above 100Deg.F) | 4.00 QTS. | — | — |
| Limited, 2D Coupe, 3.8 L, 4T60/ME9 — 3.8L Eng | API - SAE 5W-30 (Below -20Deg.F to 60Deg.F), 10W-30 (Preferred) (0Deg.F to Above 100Deg.F) | 4.00 QTS. | — | — |
| Limited, 4D Sedan, 3.1 T, 440T4/ME9 — 3.1L Eng | API - SAE 5W-30 (Below -20Deg.F to 60Deg.F), 10W-30 (Preferred) (0Deg.F to Above 100Deg.F) | 4.00 QTS. | — | — |
| Limited, 4D Sedan, 3.1 T, 4T60/ME9 — 3.1L Eng | API - SAE 5W-30 (Below -20Deg.F to 60Deg.F), 10W-30 (Preferred) (0Deg.F to Above 100Deg.F) | 4.00 QTS. | — | — |
| Limited, 4D Sedan, 3.8 L, 440T4/ME9 — 3.8L Eng | API - SAE 5W-30 (Below -20Deg.F to 60Deg.F), 10W-30 (Preferred) (0Deg.F to Above 100Deg.F) | 4.00 QTS. | — | — |
| Limited, 4D Sedan, 3.8 L, 4T60/ME9 — 3.8L Eng | API - SAE 5W-30 (Below -20Deg.F to 60Deg.F), 10W-30 (Preferred) (0Deg.F to Above 100Deg.F) | 4.00 QTS. | — | — |
Buy the right oil
Buy 5W-30 motor oil on Amazon1991 Buick Regal oil filter on AmazonAs an Amazon Associate we earn from qualifying purchases made through these links.
More specs & repair guides for your Regal
1991 Buick Regal factory service manualAll fluid capacities (transmission, coolant, brakes)Powered by factory manual data from our partner site 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 1991 Buick Regal take?
The 1991 Buick Regal takes 5W-30 motor oil (API - SAE 5W-30 (Below -20Deg.F to 60Deg.F), 10W-30 (Preferred) (0Deg.F to Above 100Deg.F)), per the factory service manual.
How much oil does a 1991 Buick Regal take?
The 1991 Buick Regal holds 4.0 quarts with a filter change.
Can I use synthetic oil in my 1991 Buick Regal?
Yes. 5W-30 is widely available as a full synthetic, and synthetic is safe (often recommended) for the 1991 Buick Regal. What matters most is matching the factory viscosity and specification, then changing the oil and filter on schedule.
Other Buick Regal years
2020 Regal2019 Regal2018 Regal2017 Regal2016 Regal2015 Regal2014 Regal2013 Regal2012 Regal2011 Regal2004 Regal2003 Regal2002 Regal2001 Regal2000 Regal1999 Regal1998 Regal1997 Regal1996 Regal1995 Regal1994 Regal1993 Regal1992 Regal1990 Regal1989 Regal1988 Regal1987 Regal1986 Regal1985 Regal1984 Regal1983 Regal