Signs You Need To Change Your Oil Filter
Author: Toby Date Posted:9 May 2025
Your oil filter might be small, but it plays a massive role in keeping your engine healthy. Research shows that when oil isn’t properly filtered, it can reduce engine efficiency by up to 20%. That might not sound like much on paper, but in real-world terms, it means your engine has to work harder to deliver the same performance — burning through more fuel, creating more heat, and putting extra strain on moving parts.
Over time, that reduced efficiency can lead to increased fuel costs, premature wear on internal components, and even expensive engine repairs. All from a part that costs less than a tank of fuel. When your oil filter gets clogged or worn out, it simply can’t do its job — and that’s when the trouble starts.
Not sure if yours is due for a change? Here are some signs to watch out for — and how to avoid letting a $20 filter turn into a $2,000 problem.
What Does an Oil Filter Actually Do?
Before we jump into the warning signs, let’s cover the basics. Oil filters trap dirt, sludge, and metal particles from the engine oil, keeping everything running smoothly. A clean filter helps your engine last longer and run more efficiently. But once it’s full or clogged, your oil won’t flow properly — and that’s when problems start.
How Often Should Oil Filter Be Changed?
Generally, most vehicles should have their oil filter replaced every 5,000 to 10,000 km, or with every oil change — whichever comes first. But if you’re driving in tough conditions (towing, off-roading, stop-start traffic), it’s a good idea to change it more frequently.
While it’s technically possible to change oil without changing the oil filter, it’s not ideal if you want the best performance and longevity from your engine. The filter holds onto debris from your old oil, so replacing both together ensures you’re starting fresh every time.
Always check your owner’s manual for specific intervals, as some modern vehicles have longer service schedules.
How Long Do Oil Filters Last?
Most quality oil filters are designed to last through one oil change cycle. That usually means around 6 months or 10,000 km. Stretching it too far can lead to decreased engine performance or, worse, long-term damage from dirty oil circulating through your system.
Signs Your Oil Filter Needs Replacing
If you’ve gone a while without a change — or if your filter’s already had a tough life — you might start seeing these red flags:
| 1. Dirty or Dark Engine Oil If your oil looks dark and gritty on the dipstick, your filter’s probably struggling to do its job. Clean oil should be a light amber colour. |
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2. Engine Running Rough or Noisy
A clogged oil filter can reduce oil flow, causing parts to grind or perform poorly. You might notice more engine noise, especially on startup.
3. Oil Pressure Warning Light
Low oil pressure often means oil isn’t circulating properly — and a blocked filter could be the culprit. Don’t ignore this light!
4. Drop in Fuel Efficiency
If your engine has to work harder because of dirty oil or poor lubrication, it’ll use more fuel. That’s bad news for both performance and your wallet.
5. Exhaust Smoke or Burning Smell
Old or clogged filters can cause oil to back up and burn. If you're seeing smoke or smelling something off, check your oil and filter right away.
Shop Oil Filters and Service Essentials at Superspares
Changing your oil filter is one of the easiest and cheapest ways to protect your engine. It’s tempting to push it out, but it’s really not worth the risk — especially in harsh Aussie driving conditions.
Need a new filter? Superspares is your trusted car parts store, offering a wide range of car filters and other car service essentials for passenger cars, performance builds, and 4WDs — all with fast delivery Australia-wide.
