1989 Mercury Grand Marquis Oil Type & Capacity: 5W-30 (5.0 quarts)
The 1989 Mercury Grand Marquis 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 |
|---|---|---|---|---|
| Colony Park GS | SAE 5W-30 (Preferred) (Below -20Deg.F to 100Deg.F), 10W-30 (0Deg.F to Above 100Deg.F) | 5.00 QTS. | 4.00 QTS. | — |
| Colony Park LS | SAE 5W-30 (Preferred) (Below -20Deg.F to 100Deg.F), 10W-30 (0Deg.F to Above 100Deg.F) | 5.00 QTS. | 4.00 QTS. | — |
| GS | SAE 5W-30 (Preferred) (Below -20Deg.F to 100Deg.F), 10W-30 (0Deg.F to Above 100Deg.F) | 5.00 QTS. | 4.00 QTS. | — |
| LS | SAE 5W-30 (Preferred) (Below -20Deg.F to 100Deg.F), 10W-30 (0Deg.F to Above 100Deg.F) | 5.00 QTS. | 4.00 QTS. | — |
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More factory specs & repair guides for your Grand Marquis
🛞 1989 Mercury Grand Marquis Tire Size & Pressure →🌧️ 1989 Mercury Grand Marquis Wiper Blade Sizes →💡 1989 Mercury Grand Marquis Light Bulb Sizes →📖 1989 Mercury Grand Marquis Factory Service Manual →All fluid capacities (transmission, coolant, brakes)Powered by factory manual data from our partner network AllOEMManuals.com.
Coolant capacity
14.4 quarts (13.62 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 1989 Mercury Grand Marquis take?
The 1989 Mercury Grand Marquis 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 1989 Mercury Grand Marquis?
The 1989 Mercury Grand Marquis oil capacity is 5.0 quarts with a filter change, or 4.0 quarts without changing the filter.
How often should I change the oil in my 1989 Mercury Grand Marquis?
Most 1989 Mercury Grand Marquis 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 Grand Marquis?
Yes. 5W-30 is widely available as a full synthetic, and synthetic is safe (often recommended) for the 1989 Mercury Grand Marquis. What matters most is matching the factory viscosity and specification, then changing the oil and filter on schedule.