1986 Mercury Cougar Oil Type & Capacity: 5W-30 (5.0 quarts)
The 1986 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 |
|---|---|---|---|---|
| GS, 3.8 3, AOD | SAE 5W-30 (Preferred) (Below -20Deg.F to 100Deg.F), 10W-30 (0Deg.F to Above 100Deg.F) | 5.00 QTS. | — | — |
| GS, 3.8 3, C5 | SAE 5W-30 (Preferred) (Below -20Deg.F to 100Deg.F), 10W-30 (0Deg.F to Above 100Deg.F) | 5.00 QTS. | — | — |
| GS, 5.0 F | SAE 5W-30 (Preferred) (Below -20Deg.F to 100Deg.F), 10W-30 (0Deg.F to Above 100Deg.F) | 5.00 QTS. | — | — |
| LS, 3.8 3, AOD | SAE 5W-30 (Preferred) (Below -20Deg.F to 100Deg.F), 10W-30 (0Deg.F to Above 100Deg.F) | 5.00 QTS. | — | — |
| LS, 3.8 3, C5 | SAE 5W-30 (Preferred) (Below -20Deg.F to 100Deg.F), 10W-30 (0Deg.F to Above 100Deg.F) | 5.00 QTS. | — | — |
| LS, 5.0 F | SAE 5W-30 (Preferred) (Below -20Deg.F to 100Deg.F), 10W-30 (0Deg.F to Above 100Deg.F) | 5.00 QTS. | — | — |
| XR7, Automatic | SAE 5W-30 (Preferred) (Below -20Deg.F to 100Deg.F), 10W-30 (0Deg.F to Above 100Deg.F) | 5.00 QTS. | — | — |
| XR7, Standard | SAE 5W-30 (Preferred) (Below -20Deg.F to 100Deg.F), 10W-30 (0Deg.F to Above 100Deg.F) | 5.00 QTS. | — | — |
More factory specs & repair guides for your Cougar
🛞 1986 Mercury Cougar Tire Size & Pressure →🌧️ 1986 Mercury Cougar Wiper Blade Sizes →💡 1986 Mercury Cougar Light Bulb Sizes →📖 1986 Mercury Cougar Factory Service Manual →All fluid capacities (transmission, coolant, brakes)Powered by factory manual data from our partner network AllOEMManuals.com.
Coolant capacity
11.8 quarts (11.16 L) — 50/50 mixture of FORD Premium Cooling System Fluid and water. Specification: ESE M97B44 A.
Frequently asked questions
What type of oil does a 1986 Mercury Cougar take?
The 1986 Mercury Cougar takes 5W-30 motor oil (SAE 5W-30 (Preferred) (Below -20Deg.F to 100Deg.F), 10W-30 (0Deg.F to Above 100Deg.F)), per the factory service manual.
What is the oil capacity of a 1986 Mercury Cougar?
The 1986 Mercury Cougar oil capacity is 5.0 quarts with a filter change.
How often should I change the oil in my 1986 Mercury Cougar?
Most 1986 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 1986 Mercury Cougar?
Yes. 5W-30 is widely available as a full synthetic, and synthetic is safe (often recommended) for the 1986 Mercury Cougar. What matters most is matching the factory viscosity and specification, then changing the oil and filter on schedule.