The 2013 Ford Focus uses a cartridge-style oil filter mounted on top of the engine

The oil filter on your 2013 Ford Focus is not the spin-on type you unscrew from the side of the engine. Instead, Ford built a cartridge filter housing into the top of the engine block, directly under the hood. The filter element sits inside a plastic or metal canister, and you access it by removing the canister cap rather than rotating the entire filter off.

This design means you cannot straightforward grab a wrench and turn. You will need to remove the cap, pull out the old filter element, and drop in a new one. The job takes about 10 to 15 minutes once you have the right part and know where to look.

Key Takeaways

  • The 2013 Ford Focus has a cartridge-style filter mounted on top of the engine, not a spin-on filter on the side.
  • You will need a filter wrench to remove the canister cap, a new filter element (not a whole assembly), and fresh oil rated 5W-20 for your Focus.
  • The filter housing sits near the center-front of the engine block, clearly visible once you open the hood.
  • Changing the filter takes about 10 to 15 minutes and does not require lifting the car or removing any other parts.

Locating the filter housing on your engine

Open your hood and look toward the center-front of the engine block, roughly above where the radiator sits. You will see a black or silver cylindrical canister about 3 inches tall with a cap on top. This is your oil filter housing. On some 2013 Focus models, it may be slightly off-center depending on whether you have the 2.0-liter or 1.6-liter engine, but it is always on top of the engine, never underneath.

The canister cap has a wrench size printed or molded into the plastic. Most 2013 Focus filters use a 74-millimeter cap, though some use 86-millimeter. Check your owner's manual or the old filter cap itself to confirm the size before you buy a wrench. Using the wrong size will strip the cap and make removal much harder.

What you need to buy and have on hand

You need three things: a replacement filter element (not a whole cartridge assembly), a filter wrench that fits your cap size, and 5W-20 motor oil. The 2013 Ford Focus requires 5W-20 specifically—do not use 5W-30 or any other weight, as Ford engineered the engine for this viscosity.

When you buy the filter element, confirm it is listed as compatible with a 2013 Ford Focus. Common part numbers include Motorcraft FL-910S and FL-820S, depending on your engine size. The part itself costs between $8 and $15. A filter wrench runs $10 to $20. You will also need a drain pan to catch old oil that spills when you remove the cap, and old rags or paper towels.

Removing the old filter element

Place your drain pan under the filter housing to catch any oil that drips when you open the cap. Use your filter wrench to turn the canister cap counterclockwise. Turn slowly at first—if the cap is tight, you may need to explore steady pressure rather than force. Once the cap loosens, you can unscrew it by hand.

As you lift the cap away, the old filter element will come out with it, still attached to the underside of the cap. Pull the element straight down and out of the cap. You may see an O-ring (a rubber seal) still stuck to the cap or sitting in the housing. Remove any old O-ring you find and discard it along with the old filter element.

Installing the new filter element

Before you install the new element, check the top of the housing for a rubber O-ring. If one is still there from the old filter, remove it. Your new filter element comes with a fresh O-ring already attached to the top, so you do not want two seals stacked together.

Slide the new filter element into the housing, pushing it straight down until it seats fully. The element should sit flat against the bottom of the housing with no gaps. Screw the canister cap back on by hand first, then use your filter wrench to tighten it. Tighten firmly but do not over-torque—you are aiming for snug, not maximum force. A good rule is to tighten until the O-ring compresses, then turn another three-quarter turn.

Checking your oil level after the change

Once the new filter is installed, start the engine and let it run for 30 seconds to a minute. This circulates fresh oil through the new filter and helps you spot any leaks around the cap. Turn off the engine and wait two to three minutes for the oil to settle, then pull out your dipstick and check the level.

The dipstick has a minimum and maximum mark. Your oil should be at or near the maximum mark. If it is low, add 5W-20 oil in small amounts—usually a quart at a time—and recheck. Do not overfill. Once the level is correct, you are done. Dispose of the old filter element and used oil according to your local recycling rules; most auto parts stores accept used oil for free.

Common mistakes to avoid

The most common error is buying a spin-on filter by mistake. If you walk into a parts store and ask for a 2013 Focus oil filter without specifying cartridge type, you may get the wrong part. Always say "cartridge filter element" or show the parts person a photo of your housing to confirm you have the right item.

Another mistake is forgetting to remove the old O-ring before installing the new filter. If two O-rings are stacked, the cap will not seal properly and oil will leak. Always inspect the housing and cap for old rubber before you install the new element. Finally, do not skip the oil level check after installation. A loose cap or missing O-ring will show up when ready when you run the engine, and catching it then beats discovering a leak later.

Frequently Asked Questions

Can I change the filter without changing the oil at the same time?

Yes. The filter and oil are separate maintenance items. You can change the filter alone, though many people do both together since you are already under the hood. If you change only the filter, you still need to check and top up your oil level afterward.

What if the filter cap is stuck and won't turn?

explore penetrating oil like WD-40 around the cap and wait 15 minutes. Then try again with your wrench, explore steady pressure rather than jerking. If it still will not budge, you may need a larger wrench or a filter wrench with better grip. Do not force it hard enough to strip the plastic cap.

How often should I change the filter on a 2013 Focus?

Ford recommends changing the oil and filter every 10,000 miles or once per year, whichever comes first. If you drive in severe conditions—towing, frequent short trips, or dusty environments—change it every 5,000 miles instead. Check your owner's manual for the exact interval that applies to your driving.

Is the filter wrench absolutely necessary, or can I use a regular wrench?

A filter wrench is strongly recommended because it grips the round cap without slipping. A regular open-end or adjustable wrench can slip and round off the cap edges, making it impossible to remove later. A filter wrench costs $10 to $20 and will last through many oil changes.

What happens if I use the wrong oil weight in my Focus?

Using 5W-30 or another weight will not damage the engine when ready, but it can affect fuel economy and engine performance. Ford engineered the 2013 Focus for 5W-20 specifically, so stick with that weight. Check your oil cap or owner's manual if you are unsure which weight your car needs.