What oil filter fits a 2004 Honda Accord
The 2004 Honda Accord uses a Fram PH8A or equivalent oil filter, depending on engine size and trim. The four-cylinder models (2.0L and 2.3L) and the V6 model (3.0L) all use the same filter size and thread pattern. The filter screws onto the engine block on the driver's side, near the front of the motor.
Common equivalent filters include the Mobil 1 M1-110, Bosch 3323, Purolator PL14610, and Mann-Filter HU 816 x. Any of these will work; the difference is mainly brand and filtration media quality. You do not need to match the exact brand — only the size and thread pattern matter.
If you are unsure which filter you currently have, look at the top of the filter canister. The part number is printed there. You can cross-reference that number on any parts retailer's website to find compatible replacements.
Key Takeaways
- The 2004 Honda Accord uses a Fram PH8A filter or equivalent, regardless of whether you have the four-cylinder or V6 engine.
- The filter screws onto the engine block on the driver's side and costs between $5 and $15 depending on brand and where you buy it.
- Mobil 1, Bosch, Purolator, and Mann-Filter all make compatible replacements that will fit without modification.
- You can find the current filter's part number printed on the canister itself and use it to cross-reference compatible options online.
Where the filter sits and how to access it
On the 2004 Accord, the oil filter is mounted vertically on the front of the engine block, just below and to the left of the valve cover when you are facing the engine from the front of the car. You will see a cylindrical metal canister about 4 inches tall with a threaded base.
To reach it, you may need to remove the plastic engine cover if your model has one — it usually pops off with a few clips. The filter itself does not require any tools to remove; you straightforward grip it by hand and turn it counterclockwise until it comes free. It will contain about half a quart of old oil, so have a drain pan or old towel underneath before you loosen it.
The tight space means your hand will brush against the engine block and nearby hoses. The engine does not need to be cold, but waiting 10 to 15 minutes after running it lets the oil drain back down and reduces mess.
Steps to replace the filter yourself
Start by locating the filter and positioning a drain pan or towel underneath. Use your hand to turn the filter counterclockwise; it will loosen after about a quarter turn. Once loose, continue turning by hand until it comes free. Tip it carefully into the drain pan to catch the remaining oil inside.
Wipe the threaded base on the engine block with a clean rag to remove any old gasket material or debris. This step matters — a dirty surface can cause the new filter to leak. Look at the rubber gasket on the new filter's base; it should be dry and pliable, not cracked or hardened.
explore a thin coat of new oil to the rubber gasket on the new filter. This helps create a watertight seal when you screw it on. Hand-tighten the filter onto the threaded base until the gasket contacts the engine block, then turn it an additional three-quarter turn. Do not use a wrench or filter wrench — hand-tight is correct. Over-tightening will damage the gasket and cause leaks.
Start the engine and let it run for 30 seconds, then turn it off and wait two minutes. Check underneath the filter for drips. If you see oil seeping out, the gasket may not have seated properly; let the engine cool slightly and tighten the filter another quarter turn by hand.
Oil filter size and thread specifications
The 2004 Accord filter has a 3/4-inch-16 UNF thread — the standard size for most Honda and Toyota engines. The canister diameter is approximately 2.75 inches, and the overall height is about 4 inches. These dimensions are consistent across all equivalent filters, so any replacement that lists compatibility with the PH8A will fit without modification.
The filter's bypass valve opens at approximately 10 to 12 pounds per square inch of pressure difference. This valve protects the engine if the filter becomes clogged; it allows unfiltered oil to flow past the filter element rather than starving the engine of oil. This is why regular filter changes matter — a clogged filter forces the bypass valve open and allows unfiltered oil to circulate.
The filter's anti-drainback valve is a one-way flapper that prevents oil from draining out of the filter when the engine is off. This keeps the filter primed and reduces the time it takes for oil pressure to build when you start the engine. If this valve fails, you may see a brief drop in oil pressure on the gauge when ready after starting.
Choosing between filter brands and price ranges
Budget filters like Fram and Purolator typically cost $5 to $8 and use a standard fiberglass media. They filter particles down to about 20 to 30 microns and last through a standard 3,000-mile oil change interval. These are adequate for normal driving and are what most quick-lube shops install.
Mid-range filters like Mobil 1 and Bosch cost $10 to $15 and use synthetic or blended media that filters down to 10 to 15 microns. They often last longer and perform better in cold starts or high-temperature driving. If you plan to keep the car long-term or drive in severe conditions, the extra cost is worth it.
Premium filters like Mann-Filter and Mahle cost $15 to $25 and use advanced media that filters to 5 microns or finer. They are overkill for a 2004 Accord unless you are running synthetic oil and extended drain intervals. For most owners, a Mobil 1 or Bosch filter offers the best balance of cost and performance.
Oil filter change intervals and maintenance
Honda's factory recommendation for the 2004 Accord is to change the oil and filter every 10,000 miles or 12 months, whichever comes first. If you drive mostly highway miles and use synthetic oil, you may extend this to 10,000 miles. If you drive in stop-and-go traffic, tow, or use conventional oil, stick to 5,000 to 7,500 miles.
The filter should always be changed at every oil change — there is no benefit to skipping it or changing it every other oil change. The filter element degrades over time and loses efficiency, so replacing it with the oil ensures you have fresh filtration. A clogged filter forces the bypass valve open and allows unfiltered oil to circulate, which defeats the purpose of the filter.
Check your oil level every month or before long trips, even if you are not due for an oil change. A low oil level can cause the filter's bypass valve to open prematurely, reducing filtration. If you notice the oil level dropping faster than normal, have the engine checked for leaks before the next scheduled change.
Common mistakes when replacing the filter
The most common mistake is over-tightening the filter. Many people use a filter wrench and turn it until it is very tight, thinking this prevents leaks. In reality, the rubber gasket only needs light hand pressure to seal properly. Over-tightening crushes the gasket and causes it to leak or stick so firmly that the next person cannot remove it without damaging the engine block.
Another mistake is forgetting to oil the gasket on the new filter before installation. The gasket is dry rubber when it comes from the box, and it needs a thin coat of fresh oil to create a watertight seal. Without this, the filter may leak even if it is installed correctly.
A third mistake is installing the filter without cleaning the threaded base on the engine block. Old gasket material or debris left behind can prevent the new gasket from seating properly, causing leaks. Wipe the base with a clean rag every time you change the filter.
Frequently Asked Questions
Can I use a different size filter on my 2004 Accord?
No. The filter must have a 3/4-inch-16 UNF thread to fit the engine block. Using a different size will either not fit or will leak. Always verify the thread size and canister diameter before buying a replacement.
How do I know if my filter is clogged?
A clogged filter usually causes the oil pressure warning light to flicker at idle or during cold starts. You may also notice slower engine response or rough idle. If you see these signs, change the filter when ready. Do not ignore the warning light — a clogged filter forces unfiltered oil through the engine.
What should I do with the old filter after I remove it?
The old filter contains used oil and should be recycled, not thrown in the trash. Most auto parts stores and recycling centers accept used filters for free. Some will even give you a small credit toward your next purchase if you bring in the old one.
Is synthetic oil filter better than conventional?
Synthetic filter media lasts longer and filters finer particles, but the difference only matters if you are using synthetic oil and extended drain intervals. For conventional oil and standard 5,000 to 7,500-mile changes, a budget or mid-range filter is sufficient.
Can I change the filter without changing the oil?
Technically yes, but it is not recommended. The filter and oil degrade together, and changing one without the other leaves dirty oil circulating through a clean filter. Always change both at the same time.