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What motor oil to put in a 93 grand marquis?

A 1993 Ford Grand Marquis requires 10W-30 motor oil. However, always check your owner's manual to confirm, as this is the *recommended* grade, and specific needs may vary slightly depending on your climate and driving conditions. The manual might also specify a particular oil type (e.g., API certification). Using the correct oil is crucial for the engine's longevity.