1991 Mercury Sable Oil Type & Capacity: 5W-30 (4.5 quarts)
The 1991 Mercury Sable takes 5W-30 motor oil — 4.5 quarts with a filter change, per the factory service manual.
Factory-spec answer
5W-30 — 4.5 quarts with filter
Oil capacity by engine
| Engine | Oil Type (viscosity) | Capacity w/ Filter | Capacity w/o Filter | Notes |
|---|---|---|---|---|
| GS, 4D Sedan, 3.0 U | SAE 5W-30 (Preferred) (Below 0Deg.F to 100Deg.F), 10W-30 (0Deg.F to Above 100Deg.F) | 4.50 QTS. | — | — |
| GS, 4D Sedan, 3.8 4 | SAE 5W-30 (Preferred) (Below 0Deg.F to 100Deg.F), 10W-30 (0Deg.F to Above 100Deg.F) | 4.50 QTS. | — | — |
| GS, 4D Wagon, 3.0 U | SAE 5W-30 (Preferred) (Below 0Deg.F to 100Deg.F), 10W-30 (0Deg.F to Above 100Deg.F) | 4.50 QTS. | — | — |
| GS, 4D Wagon, 3.8 4 | SAE 5W-30 (Preferred) (Below 0Deg.F to 100Deg.F), 10W-30 (0Deg.F to Above 100Deg.F) | 4.50 QTS. | — | — |
| LS, 4D Sedan, 3.0 U | SAE 5W-30 (Preferred) (Below 0Deg.F to 100Deg.F), 10W-30 (0Deg.F to Above 100Deg.F) | 4.50 QTS. | — | — |
| LS, 4D Sedan, 3.8 4 | SAE 5W-30 (Preferred) (Below 0Deg.F to 100Deg.F), 10W-30 (0Deg.F to Above 100Deg.F) | 4.50 QTS. | — | — |
| LS, 4D Wagon, 3.0 U | SAE 5W-30 (Preferred) (Below 0Deg.F to 100Deg.F), 10W-30 (0Deg.F to Above 100Deg.F) | 4.50 QTS. | — | — |
| LS, 4D Wagon, 3.8 4 | SAE 5W-30 (Preferred) (Below 0Deg.F to 100Deg.F), 10W-30 (0Deg.F to Above 100Deg.F) | 4.50 QTS. | — | — |
Complete Oil Change Bundle for 1991 Mercury Sable
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More factory specs & repair guides for your Sable
🛞 1991 Mercury Sable Tire Size & Pressure →🌧️ 1991 Mercury Sable Wiper Blade Sizes →💡 1991 Mercury Sable Light Bulb Sizes →📖 1991 Mercury Sable Factory Service Manual →All fluid capacities (transmission, coolant, brakes)Powered by factory manual data from our partner network AllOEMManuals.com.
Coolant capacity
11.0 quarts (10.4 L) — 50/50 mixture of FORD Premium Cooling System Fluid and water
Frequently asked questions
What type of oil does a 1991 Mercury Sable take?
The 1991 Mercury Sable takes 5W-30 motor oil (SAE 5W-30 (Preferred) (Below 0Deg.F to 100Deg.F), 10W-30 (0Deg.F to Above 100Deg.F)), per the factory service manual.
What is the oil capacity of a 1991 Mercury Sable?
The 1991 Mercury Sable oil capacity is 4.5 quarts with a filter change.
How often should I change the oil in my 1991 Mercury Sable?
Most 1991 Mercury Sable 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 — Mercury recommends intervals based on driving conditions, not just mileage.
Can I use synthetic oil in my 1991 Mercury Sable?
Yes. 5W-30 is widely available as a full synthetic, and synthetic is safe (often recommended) for the 1991 Mercury Sable. What matters most is matching the factory viscosity and specification, then changing the oil and filter on schedule.