2003 Mercury Grand Marquis Oil Type & Capacity
The 2003 Mercury Grand Marquis takes 5W-20 motor oil — 6.0 quarts with a filter change, per the factory service manual.
Factory-spec answer
5W-20 — 6.0 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 | 6.00 QTS. | — | Use of synthetic or synthetic blend motor oil is not mandatory. Engine oil need only to meet the requirements of FORD Specification: WSS-M2C153-H and the API Certification mark. |
| LS | SAE 5W-20 Premium Synthetic Blend Motor Oil | 6.00 QTS. | — | Use of synthetic or synthetic blend motor oil is not mandatory. Engine oil need only to meet the requirements of FORD Specification: WSS-M2C153-H and the API Certification mark. |
| LSE | SAE 5W-20 Premium Synthetic Blend Motor Oil | 6.00 QTS. | — | Use of synthetic or synthetic blend motor oil is not mandatory. Engine oil need only to meet the requirements of FORD Specification: WSS-M2C153-H and the API Certification mark. |
Buy the right oil
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More specs & repair guides for your Grand Marquis
2003 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) — FORD Premium Cooling System Fluid or FORD Extended Life Engine Coolant. If the vehicle's coolant is (green color) use: FORD Premium Cooling System Fluid. If it is (orange color) use: FORD Extended Life Engine Coolant.
Frequently asked questions
What type of oil does a 2003 Mercury Grand Marquis take?
The 2003 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 2003 Mercury Grand Marquis take?
The 2003 Mercury Grand Marquis holds 6.0 quarts with a filter change.
Can I use synthetic oil in my 2003 Mercury Grand Marquis?
Yes. 5W-20 is widely available as a full synthetic, and synthetic is safe (often recommended) for the 2003 Mercury Grand Marquis. What matters most is matching the factory viscosity and specification, then changing the oil and filter on schedule.