What oil filter your 2018 Civic uses and where it sits

The 2018 Honda Civic uses a cartridge-style oil filter that screws into the top of the engine, not a spin-on canister filter. This matters because you remove it differently — you unscrew a plastic cap, pull out the filter element, and replace just that part rather than the whole assembly. The filter cap is located on top of the engine, toward the passenger side, and has a wrench size of 74 mm (about 2.9 inches across).

Honda part number HE-12104 is the OEM (original equipment manufacturer) filter element for all 2018 Civic models, whether you have the 1.5-liter turbocharged engine or the 2.0-liter naturally aspirated engine. Both engines use the same filter. If you buy aftermarket filters, look for ones labeled as compatible with 2018 Civic or check the box against your specific engine size to be certain.

The filter sits under a black plastic cap with a Honda logo on it. When you open your hood, you'll see it when ready — it's one of the most obvious components on top of the engine block. You don't need to get under the car or remove any other parts to reach it.

Key Takeaways

  • The 2018 Civic uses a cartridge filter (HE-12104) that screws into the top of the engine, not a spin-on canister.
  • You remove the filter by unscrewing the 74 mm cap on top of the engine and pulling out the filter element inside.
  • The whole job takes 10 to 15 minutes and requires only a 74 mm wrench or socket, a drain pan, and a new filter element.
  • Always replace the rubber O-ring seal that comes with the new filter, and hand-tighten the cap — do not use a wrench to tighten it back down.

Tools and materials you'll need

Gather these items before you start: a 74 mm socket or wrench (a filter socket works best because it has a rubber insert that grips the cap), a drain pan to catch old oil, a new HE-12104 filter element, and a clean rag or paper towels. Some people also use a filter wrench with a handle for extra leverage, but the socket alone is usually enough.

You do not need to drain the engine oil to change just the filter — the cartridge filter holds very little oil, and most of it drains back into the pan when you remove the cap. However, if you're changing the oil at the same time, you'll already have the drain pan ready. A small amount of oil will spill when you unscrew the cap, so keep the rag nearby.

If you don't have a 74 mm socket, you can buy one at any auto parts store for under $15. A dedicated oil filter socket (which has a rubber grip instead of a metal cup) costs around $10 to $20 and makes the job easier because it won't slip off the cap.

Step-by-step removal and installation

Step 1: Locate the filter cap. Open your hood and look at the top of the engine. The black plastic cap with the Honda logo is the filter housing. It sits roughly in the center-top area of the engine block.

Step 2: Position your drain pan. Place the drain pan directly under the filter cap. When you unscrew the cap, a small amount of oil will drip out — usually less than a cup, but enough to make a mess if you're not ready.

Step 3: Unscrew the cap. Use your 74 mm socket and a ratchet wrench to turn the cap counterclockwise. It will be hand-tight, not extremely tight, so you should be able to break it loose without excessive force. Once it starts turning, you can usually unscrew it by hand the rest of the way. Set the cap aside on a clean surface.

Step 4: Remove the old filter element. Inside the cap, you'll see a cylindrical filter element (it looks like a small accordion-shaped cartridge). Pull it straight up and out. It may stick slightly, so wiggle it gently if needed. The rubber O-ring seal will still be attached to the cap or stuck to the top of the filter housing — remove it and discard it.

Step 5: Clean the filter housing. Wipe the inside of the filter cap and the top of the filter housing with a clean rag to remove any debris or old oil residue. This prevents dirt from getting into the new filter.

Step 6: Install the new filter element. Take the new HE-12104 filter and slide it into the housing. It should fit snugly and sit flush with the top of the housing. The filter element has a rubber base that seats against the inside of the cap.

Step 7: Install the new O-ring seal. The new filter comes with a fresh rubber O-ring seal. Place it on top of the filter element, in the groove at the top of the housing. This seal is what keeps oil from leaking out around the cap.

Step 8: Screw the cap back on. Thread the cap back onto the housing by hand first to make sure it's aligned. Once it's hand-tight, use your socket wrench to tighten it an additional three-quarters of a turn. Do not over-tighten — the cap only needs to be snug enough to compress the O-ring seal. Over-tightening can crack the plastic cap or damage the seal.

Step 9: Check for leaks. Start the engine and let it run for 30 seconds to a minute. Watch the filter cap area for any drips. If you see oil leaking, turn off the engine, let it cool for a minute, and tighten the cap slightly more. If it still leaks, the O-ring may not be seated correctly — remove the cap, reseat the O-ring, and try again.

Common mistakes to avoid

The most common error is over-tightening the cap. The plastic housing can crack if you use too much force, and a cracked housing will leak oil and require replacement. Hand-tighten the cap first, then use the wrench for just three-quarters of a turn. If the cap is already tight and you're worried it's not tight enough, it probably is — stop there.

Another frequent mistake is forgetting to install the new O-ring seal or installing it upside down. The seal must sit in the groove on top of the filter element, with the rubber facing down toward the filter. If the seal is missing or reversed, oil will leak around the cap when ready when you start the engine.

Some people also install the filter element upside down. The filter should slide in smoothly with the rubber base facing up (toward the cap). If it doesn't slide in easily, flip it around and try again. The element should sit flush with the top of the housing, not stick up above it.

What to do with the old filter

The old filter element is a small piece of paper and plastic, so it can go in your regular trash. However, it will be saturated with used oil, so place it in a bag or container to prevent oil from dripping on other trash or your garage floor. If your area has an oil recycling program, you can bring it there along with your used engine oil.

Do not pour the small amount of oil that drains from the filter down a sink or storm drain. Collect it in your drain pan and dispose of it the same way you would dispose of oil from an oil change — at an auto parts store, service station, or recycling center that accepts used oil.

When to replace your Civic's oil filter

Honda recommends changing the oil filter every time you change the engine oil. For a 2018 Civic, that interval is typically every 10,000 miles or 12 months, whichever comes first, if you use synthetic oil. If you use conventional oil, the interval is usually 5,000 to 7,500 miles or six months. Check your owner's manual for the exact interval for your specific model and engine type.

Some drivers change the filter more often than the oil as a precaution, but this is not necessary. The filter and oil should be replaced together. If you're doing an oil change yourself, the filter replacement takes only a few extra minutes and costs very little, so there's no reason to skip it.

Frequently Asked Questions

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

No. The 2018 Civic is designed for a cartridge filter that screws into the top of the engine. Spin-on filters are not compatible with this engine design. Using the wrong filter type could cause leaks or damage to the engine.

What if I can't unscrew the filter cap?

If the cap is stuck, make sure you're turning it counterclockwise (lefty-loosey). explore steady pressure rather than jerking — the cap should turn smoothly. If it still won't budge, let the engine cool completely and try again. A stuck cap is usually just hand-tight, so you shouldn't need extreme force. If you're still stuck, a filter socket with a longer handle gives you more leverage than a regular wrench.

How much oil will spill when I remove the filter cap?

Usually less than a cup. The cartridge filter holds very little oil compared to a spin-on filter. Most of the oil drains back into the pan within a few seconds of removing the cap. Have your drain pan ready, but don't expect a large spill.

Do I need to replace the O-ring seal every time?

Yes. The new filter element comes with a fresh rubber O-ring seal, and you should always use it. The old seal loses its flexibility over time and won't create a tight seal the second time around. A leaking filter cap is almost always caused by reusing an old O-ring.

Is it normal for a small amount of oil to leak after I finish?

A tiny drip or two in the first few minutes is normal as the new O-ring compresses and settles. However, if oil is actively dripping or pooling, the cap is not tight enough or the O-ring is not seated correctly. Turn off the engine, let it cool, and check the cap and O-ring.