The Mercury Grand Marquis is an excellent option for any kind of driver looking for a comfortable and dependable ride. But as with any car—especially an older model, you need to keep up with its maintenance and know its oil capacity.

Owing a car can get expensive—especially if your bills are starting to add up. An easy way to save on your ownership costs is to change your Mercury Grand Marquis’ oil at home, but make sure you consult your owner’s manual first.

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Mercury Grand Marquis engine oil capacity

The first step to

changing the oil and filter

in your Mercury Grand Marquis is to figure out how much oil it needs.

The mercury Grand Marquis has an oil capacity of 6 quarts. Essentially, your engine needs 6 quarts of oil to work properly. But it can be confusing—why is my engine described as 4.6L? Well, this is referring to your

engine displacement

, which is how much space your cylinders take up.

Don’t confuse these numbers—you might end up underfilling your engine, which can lead to severe damage.

What kind of oil does a Mercury Grand Marquis need?

You also need to determine what type of oil you should be purchasing. Don’t purchase the first bottle of motor oil you see—it’s important to find an oil that works well with your engine to optimize performance and prolong its lifespan. Mechanics recommend you use 5W-20 motor oil for a Mercury Grand Marquis. It's up to you whether you use synthetic or conventional oil.

You want to buy 5W-20 motor oil because the W indicates that it works well in winter temperatures, and is a great oil to minimize general wear and tear. The 5 tells you that it is less viscous in colder temperatures, while the 20 indicates that it remains thin at 212°F—your engine’s normal operating temperature.

Here are some of our recommendations:

Valvoline Advanced Full Synthetic SAE 5W-20 Motor Oil

Castrol 03083 Edge 5W-20 Advanced Full Synthetic Motor Oil

Mobil Full Synthetic Motor Oil 5W-20

MORE:

Ultimate FRAM oil filter guide

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How often to change oil on a Mercury Grand Marquis

Before breaking out your tools, you need to determine whether you need to change your oil.

Mechanics recommend changing your Mercury Grand Marquis’ oil every 5,000 to 6,000 miles as part of your

basic car maintenance schedule

. But there’s always a chance that you need to change your oil earlier, so be on the lookout for the following signs:

Your oil has changed colors. Darker motor oil is an indication that your oil is dirty. Clean oil is a light color

A change in texture—look for grittier motor oil

Strange noises coming from your engine

Unfamiliar smells—especially anything that smells like oil, smoke, or burning

A decrease in your engine’s performance

MORE:

How to change your oil and oil filter

Now you’re ready to change your Mercury Grand Marquis’ oil! You’ll need a socket wrench, a drain pan, a filter wrench, a new filter, and 5W-30 motor oil.

To help your oil drain easier, warm up your car. Start your engine and let it run for five minutes—it can take longer if you’re living in a colder climate. Once it’s ready, turn the engine off,

open the hood of your car

, and follow these steps:

Take off the oil fill cap

Find the oil drain bolt and washer under the engine. The oil will start draining once you loosen the bolt, so be ready with a drain pan

Take out the old oil filter and let the oil finish draining

Replace the old filter with the new filter

Tighten the oil drain bolt and washer to 29 lb-ft

Refill the engine with your new oil and replace the fill cap

Use your dipstick as an indicator of when you’ve added enough oil. Finish everything up, and run your engine again to check for leaks. Your

oil pressure light

should turn off if you’ve done everything right.

Don’t forget to clean your workspace up! Gather the old oil in a container and bring it to a recycling depot.

Don’t forget regular insurance policy maintenance

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