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What grade engine oil do you use for a 2002 Mercury Grand Marquis?

The recommended oil grade for a 2002 Mercury Grand Marquis depends on the climate where you live. Consult your owner's manual for the most accurate recommendation, but generally:

* For moderate climates: 5W-20 is usually recommended.

* For colder climates: 5W-30 might be preferable for easier cold-weather starting.

* For hotter climates: 10W-30 might be a better choice.

Crucially: Always check your owner's manual. The recommended viscosity (the number after the "W") can vary depending on the specific engine your Grand Marquis has (4.6L or other). Using the wrong viscosity can damage your engine. The manual will also specify the oil type (conventional, synthetic blend, or full synthetic).

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