1999 Mercury Grand Marquis Oil Type & Capacity
The 1999 Mercury Grand Marquis takes 5W-20 motor oil — 5.0 quarts with a filter change, per the factory service manual.
Factory-spec answer
5W-20 — 5.0 quarts with filter
Oil capacity by engine
| Engine | Oil Type (viscosity) | Capacity w/ Filter | Capacity w/o Filter | Notes |
|---|---|---|---|---|
| GS | SAE 5W-20 Premium Synthetic Blend Motor Oil | 5.00 QTS. | — | Refer to Engine Oil recommended applications for SAE 5W-20 and 5W-30 motor oils TSB No. 02-1-9. |
| LS | SAE 5W-20 Premium Synthetic Blend Motor Oil | 5.00 QTS. | — | Refer to Engine Oil recommended applications for SAE 5W-20 and 5W-30 motor oils TSB No. 02-1-9. |
Buy the right oil
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More specs & repair guides for your Grand Marquis
1999 Mercury Grand Marquis factory service manualAll fluid capacities (transmission, coolant, brakes)Powered by factory manual data from our partner site AllOEMManuals.com.
Coolant capacity
15.8 quarts (14.95 L) — 50/50 mixture of FORD Premium Cooling System Fluid and water. DO NOT use FORD Extended Life Engine Coolant (orange color).
Frequently asked questions
What type of oil does a 1999 Mercury Grand Marquis take?
The 1999 Mercury Grand Marquis takes 5W-20 motor oil (SAE 5W-20 Premium Synthetic Blend Motor Oil), per the factory service manual.
How much oil does a 1999 Mercury Grand Marquis take?
The 1999 Mercury Grand Marquis holds 5.0 quarts with a filter change.
Can I use synthetic oil in my 1999 Mercury Grand Marquis?
Yes. 5W-20 is widely available as a full synthetic, and synthetic is safe (often recommended) for the 1999 Mercury Grand Marquis. What matters most is matching the factory viscosity and specification, then changing the oil and filter on schedule.