1989 Mercury Cougar Oil Type & Capacity: 5W-30 (5.0 quarts)
The 1989 Mercury Cougar takes 5W-30 motor oil — 5.0 quarts with a filter change, per the factory service manual.
Factory-spec answer
5W-30 — 5.0 quarts with filter
Oil capacity by engine
| Engine | Oil Type (viscosity) | Capacity w/ Filter | Capacity w/o Filter | Notes |
|---|---|---|---|---|
| LS | SAE 5W-30 (Preferred) (Below 0Deg.F to Above 100Deg.F), 10W-30 (0Deg.F to Above 100Deg.F) | 5.00 QTS. | — | — |
| XR7, Automatic | SAE 5W-30 (Preferred) (Below 0Deg.F to Above 100Deg.F), 10W-30 (0Deg.F to Above 100Deg.F) | 5.00 QTS. | — | — |
| XR7, Standard | SAE 5W-30 (Preferred) (Below 0Deg.F to Above 100Deg.F), 10W-30 (0Deg.F to Above 100Deg.F) | 5.00 QTS. | — | — |
More factory specs & repair guides for your Cougar
🛞 1989 Mercury Cougar Tire Size & Pressure →🌧️ 1989 Mercury Cougar Wiper Blade Sizes →💡 1989 Mercury Cougar Light Bulb Sizes →📖 1989 Mercury Cougar Factory Service Manual →All fluid capacities (transmission, coolant, brakes)Powered by factory manual data from our partner network AllOEMManuals.com.
Coolant capacity
11.6 quarts (10.97 L) — 50/50 mixture of FORD Premium Cooling System Fluid and water
Frequently asked questions
What type of oil does a 1989 Mercury Cougar take?
The 1989 Mercury Cougar takes 5W-30 motor oil (SAE 5W-30 (Preferred) (Below 0Deg.F to Above 100Deg.F), 10W-30 (0Deg.F to Above 100Deg.F)), per the factory service manual.
What is the oil capacity of a 1989 Mercury Cougar?
The 1989 Mercury Cougar oil capacity is 5.0 quarts with a filter change.
How often should I change the oil in my 1989 Mercury Cougar?
Most 1989 Mercury Cougar 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 1989 Mercury Cougar?
Yes. 5W-30 is widely available as a full synthetic, and synthetic is safe (often recommended) for the 1989 Mercury Cougar. What matters most is matching the factory viscosity and specification, then changing the oil and filter on schedule.