When it comes to maintaining your engine—whether it's for a ride-on mower, generator, chainsaw, or any small engine—two parts you should never overlook are oil seals and oil filters. These components might seem small, but they play a major role in keeping your machine running efficiently and reliably. Let’s break down what they are, why they matter, and how to keep them in top shape.
What Is an Oil Seal?
An oil seal, also known as a shaft seal or lip seal, is designed to keep lubricating oil from leaking out of your engine. It also prevents dust, dirt, and moisture from getting in. Oil seals are placed around rotating shafts, like those found in engines or gearboxes, and they create a tight barrier that keeps oil where it’s needed most—inside.
Without oil seals, your machine would quickly lose lubrication, which leads to overheating, wear and tear, and ultimately engine failure. In short, a good oil seal keeps your engine protected and running longer.
What Is an Oil Filter?
An oil filter cleans the engine oil by trapping dirt, metal shavings, and other harmful particles. Over time, engine oil picks up debris as it circulates through the engine. If that debris isn’t removed, it can clog small parts, wear down components, and reduce the performance of your engine.
By installing and regularly replacing your oil filter, you ensure the oil stays clean and effective at lubricating moving parts. It’s one of the simplest and most cost-effective ways to protect your engine.
Why Both Are Equally Important
Oil seals and oil filters work together to keep your engine in peak condition. Here’s how:
Oil seals prevent the oil from leaking out and contaminants from coming in.
Oil filters ensure the oil circulating through the engine is clean and free from abrasive particles.
If your oil seal is damaged, you might notice oil leaking around the shaft or even under the machine. If your oil filter is clogged or dirty, your engine might overheat, perform poorly, or suffer long-term damage. In both cases, small issues can quickly turn into expensive repairs.
Signs You Need to Replace an Oil Seal
Visible oil leaks near seals or gaskets
Excessive oil consumption
Engine running hotter than normal
Dirt or grime build-up around the seal area
Oil seals are made of rubber or similar materials that degrade over time due to heat, friction, and exposure to chemicals. If you notice any of the above signs, it might be time for a replacement.
Signs You Need a New Oil Filter
Dirty or discoloured engine oil
Decreased engine performance
Unusual engine noises
Engine warning light (in modern equipment)
Ideally, oil filters should be changed regularly—check your machine’s manual, but a general rule is after every 25-50 hours of use for small engines. If you run your equipment in dusty or demanding environments, you may need to change it more frequently.
Tips for Maintaining Oil Seals and Oil Filters
Check regularly – Give your machine a quick once-over after heavy use. Look for signs of oil leaks or dirty filters.
Replace seals during major servicing – If you’re replacing a bearing or dismantling the engine, always check the seals. It’s easier to replace them then.
Use quality parts – Cheap seals or filters might save a few dollars upfront but can cost more in damage later. Choose parts that match your engine’s specifications.
Keep oil clean – Clean oil reduces strain on both seals and filters. Make oil changes a regular part of your maintenance routine.
Store equipment properly – Extreme weather and moisture can affect seals. Keep your machines covered and dry when not in use.
Where to Find Reliable Oil Seals and Filters in Australia
At Small Engine Wreckers, we stock a wide range of oil seals and oil filters for lawn mowers, ride-on mowers, brushcutters, chainsaws, and other outdoor power equipment. Whether you're after OEM parts or high-quality aftermarket options, we’ve got what you need to keep your engine running like new.
Our team can help you choose the right parts based on your model and engine type. We’re here to make small engine maintenance simple, affordable, and stress-free.
Final Thoughts
Oil seals and oil filters might not grab your attention the way a shiny new engine or blade does—but they are absolutely essential. Regularly checking and replacing these small components can add years to your equipment’s life, improve performance, and save you from costly breakdowns.