The 2012 Ford Fusion uses a cartridge-style oil filter located on top of the engine

The oil filter on a 2012 Ford Fusion sits in a plastic housing on the driver's side of the engine, near the back. Unlike older spin-on filters that screw onto the engine block, this one uses a cartridge design — you remove a cap, pull out the filter element, and drop in a new one. This design is common on Ford vehicles from that era and takes about five minutes once you have the right part and tools.

The filter housing is white or translucent plastic, roughly the size of a soda can, and you'll see it clearly once you open the hood. Ford part number FL-400S is the original equipment filter for all 2012 Fusion models, regardless of engine size (2.5L or 3.0L). Aftermarket equivalents from Motorcraft, Fram, Bosch, and other major brands fit the same housing and cost between $8 and $15.

Key Takeaways

  • The 2012 Fusion's cartridge-style filter sits in a plastic housing on top of the engine, not screwed to the side like older designs.
  • Ford part number FL-400S is the correct filter for all 2012 Fusion models, and most aftermarket filters for this housing cost under $15.
  • You need an oil filter wrench (usually included with replacement cartridges) and a drain pan to catch old oil that spills when you remove the cap.
  • The whole job takes about five minutes and requires no special tools beyond what comes in the filter kit.

What you need before you start

Gather a new cartridge filter (FL-400S or equivalent), an oil filter wrench, a drain pan, and a clean rag or paper towels. Most replacement filter kits include the wrench, so check the box before you buy a separate one. The wrench is a cup-shaped tool that grips the filter cap from the top — it looks like a socket but with a rubber-lined interior to prevent slipping.

You do not need to drain the engine oil to change the filter. However, old oil will spill from the housing when you remove the cap, so place the drain pan underneath before you start. A few ounces of oil will come out — not the full oil pan, just what's sitting in the filter cavity.

How to remove the old filter

Open the hood and locate the white plastic filter housing on the driver's side of the engine, toward the back. Place your drain pan underneath it. Use the oil filter wrench to turn the cap counterclockwise — it will loosen and unscrew by hand once the wrench breaks it free. Turn slowly; the cap will release oil as it comes off.

Once the cap is off, you'll see the old filter cartridge standing upright inside the housing. Grab it by the top and pull straight up. It will slide out easily. Dispose of the old filter in your regular trash — cartridge filters are not hazardous waste. Wipe the inside of the housing with a clean rag to remove any debris or old oil residue.

Installing the new filter

Before you insert the new cartridge, check the rubber gasket (seal) on the underside of the cap. If the old gasket stuck to the housing, peel it off and discard it. The new filter kit includes a fresh gasket already attached to the cap, so you do not need to install one separately.

Slide the new cartridge into the housing, making sure it sits flat on the bottom. The cartridge should not be forced — it will drop in smoothly if it's oriented correctly. Screw the cap back on by hand until the gasket contacts the housing, then use the wrench to tighten it an additional three-quarter turn. Do not over-tighten; the gasket will seal at normal hand-tight pressure plus a small wrench turn.

After the filter is installed

Start the engine and let it run for 30 seconds, then turn it off. Wait two minutes and check the oil level on the dipstick — the level may have dropped slightly because fresh oil is now filling the new filter. Top off if needed. Check under the filter housing for leaks; a few drops are normal as the gasket settles, but a steady drip means the cap was not tightened enough.

If you see a leak, turn off the engine, let it cool for five minutes, and use the wrench to tighten the cap another quarter turn. Restart and recheck. The filter housing should be dry within a few minutes of running.

Common confusion points

The most common mistake is over-tightening the cap. The rubber gasket will compress and seal at normal pressure — cranking the wrench hard will actually damage the gasket and cause leaks. Hand-tight plus three-quarter turn with the wrench is the correct torque.

Another point of confusion: some owners think they need to pre-fill the new filter with oil before installation. You do not. The cartridge will fill with oil once the engine runs, and pre-filling can trap air in the system. straightforward insert the dry cartridge and screw the cap on.

Where to buy the filter

Ford dealerships stock FL-400S filters and usually have them in stock. Auto parts retailers like AutoZone, O'Reilly, NAPA, and Advance Auto Parts carry Motorcraft and multiple aftermarket brands that fit the same housing. Online retailers including Amazon and RockAuto ship them quickly. Prices vary slightly by brand and retailer, but you should find options between $8 and $20 before shipping.

If you're unsure which filter fits your specific Fusion, give the retailer your vehicle's year, make, model, and engine size (2.5L or 3.0L). They will confirm the correct part number before you buy.

Frequently Asked Questions

Can I use a spin-on filter instead of the cartridge style?

No. The 2012 Fusion is designed for the cartridge filter in the plastic housing on top of the engine. Spin-on filters do not fit this housing. If you see a spin-on filter on an older Fusion (2006–2009), that's a different generation with a different design.

How often should I change the filter?

Ford recommends changing the oil and filter every 10,000 miles or 12 months, whichever comes first. If you drive mostly short trips or in dusty conditions, change it every 5,000 miles. Check your owner's manual for the exact interval for your driving habits.

What if the old gasket stays stuck to the housing?

Use a plastic scraper or old credit card to gently peel it off. Do not use a metal tool that could scratch the sealing surface. Once the old gasket is removed, wipe the area clean with a rag. The new gasket on the replacement cap will seal properly against a clean surface.

Is it normal for a few drops of oil to leak after I install the new filter?

Yes, a few drops in the first few minutes are normal as the gasket settles. If oil continues to drip steadily after 10 minutes of running, the cap is not tight enough. Let the engine cool, tighten the cap another quarter turn, and recheck.