Oil Filler Cap Buyer's Guide
- An oil filler cap fits over the oil filler tube, covering the hole where the engine oil is poured. It keeps the oil in the oil pan and prevents it from spilling or leaking into the engine bay.
- Oil filler caps can be made out of plastic, aluminum, steel, rubber, and metal. They can come in direct or universal fit.
- An oil filler cap is essential to the drivability of your car. Without it, your engine could overheat or become a fire hazard.
- Poor maintenance or natural wear may cause an oil filler cap to fail. Tears on its gasket may also prevent it from effectively sealing engine oil inside your engine.
- The symptoms of a faulty oil filler cap include milky sludge in the oil filler tube or under the cap, oil leaks in the engine bay or under the car, a burning stench, an overheating engine, being loose or wobbly, and having contaminated oil.
- A new oil filler cap can cost anywhere between $5 and $85. The price depends on its type, design, and brand of the oil filler cap.
Every car owner knows the importance of having an adequate amount of oil in the engine of their vehicle. It improves fuel efficiency, decreases wasted power, and increases engine longevity.
However, if this oil spills into the engine bay, it could lead to a disaster. Not only is an oil leak an environmental hazard, but it can also deal catastrophic damage to the engine. That is why keeping the oil filler cap on at all times is crucial.
What Is an Oil Filler Cap?
An oil filler cap fits over the oil filler tube, covering the hole where the engine oil is poured. It keeps the oil in the oil pan and prevents it from spilling or leaking into the engine bay.
Although the location of an oil filler cap varies depending on the make and model of the car, it is usually easy to locate. It is typically located on top of the engine, particularly on the valve cover, with an oil symbol on its surface. Other oil filler caps have the words “engine oil” on them.
Types of Oil Filler Caps
Oil filler caps can be made out of plastic, aluminum, steel, rubber, or metal. They can also come in direct fit or universal fit. Direct fit means that the oil filler cap is made for a particular make and model. On the other hand, universal fit means the cap is suited to various makes and models.
Of course, it’s best to choose an engine oil filler cap based on your car’s make and model. After all, fitment can vary per vehicle. For instance, an oil filler cap for a Ford might not be the right shape or size for a Toyota or Honda.
How Important Is an Oil Filler Cap?
An oil filler cap is essential to the drivability of your car. Without it, the oil may leak and become a fire hazard, and it’s not safe to drive a car that could potentially combust anytime.
Aside from preventing oil leaks, an oil filler cap keeps the oil inside the sump. The engine needs the oil as a lubricant to operate smoothly. Without it, the engine can overheat and burn from the inside.
A functional oil filler cap should keep the oil in and prevent these troublesome scenarios.
How Does an Oil Filler Cap Fail?
Poor maintenance or natural wear can cause an oil filler cap to fail. Tears on its gasket may also prevent it from effectively sealing engine oil inside your engine. A faulty oil filler cap can cause engine failure and oil leaks that could adversely affect your car’s drivability.
When this happens, consider replacing your faulty oil filler cap immediately.
Symptoms of a Bad Oil Filler Cap
Here are the possible signs of a bad oil filler cap:
If you notice oil leaks in your engine bay or under your car, this may be because of a faulty oil filler cap. A failing oil filler cap won’t be able to keep the oil in, letting some of the oil spill out while the engine is running.
Burnt smell or an overheated engine
The scent of burning oil is also a symptom associated with an oil leak. Because the oil filler cap is damaged, the spilled oil may have covered other hot components inside the engine bay, leading to the oil evaporating and producing a burnt smell.
In some cases, the burnt smell may also come from an overheated engine, which is also a potential result of inadequate oil inside the sump due to a faulty oil filler cap.
If you’ve seen milky sludge forming on the neck of your oil filler tube or under the oil filler cap, this is an indicator that condensed water has mixed in with the oil. A damaged oil filler cap won’t be able to keep out air, water, and other residues, which form the sludge.
Aside from water and cooling liquid, dirt, debris, and other sediment can also enter the oil pan and contaminate the engine oil if the oil filler cap is faulty.
Loose or wobbly oil filler cap
Lastly, an easily noticeable symptom of a bad oil filler cap is when it’s loose or wobbly. If the cap wobbles or barely holds on to the neck of the oil filler tube after twisting or turning it, it is possibly broken. An oil filler cap should be able to seal the oil filler tube securely without any wobbling.
How Much Is a New Oil Filler Cap?
A new oil filler cap can cost anywhere between $5 and $85. The price depends on the type, design, and brand of the oil filler cap you choose. It is usually sold individually, although it can also be purchased as part of a kit.
Finding the Right Fit
When buying an oil filler cap replacement, make sure it matches the original oil filler cap that came with your vehicle. Get the right oil filler cap for your car by entering its year, make, and model into our search engine. You can also filter your search according to your preferred brand, price range, finish, material, and product fit. Then, you can browse through our wide selection of compatible heavy-duty oil filler caps.