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Audi A3 Oil Filler Cap

Signs of an Audi A3 Oil Filler Cap Trouble

While changing the oil in your vehicle, you notice a little screw-on cap that covers the oil reservoir. This is your Audi A3 oil filler cap. It seals the opening of the reservoir to prevent oil spills while your vehicle is in motion. The oil filler cap may seem inconsequential to the performance of your vehicle, but once it becomes lost or broken, you may face some under-the-hood problems in your vehicle. Below are some signs that your Audi A3 oil filler cap needs more attention.

Air coming out of the cap

The air that you see coming out of the oil cap is a product of an exhaust blow-by. Although not necessarily a bad thing, an excessive exhaust blow-by could be indicative of some major problem in the engine. It could be that your car's engine walls have warped due to extreme heat or that the pistons are not aligned in the cylinders. Another possible cause for this is the lack of oil inside the reservoir. The concern here is not really the oil cap filler, but the other components in your vehicle.

Moisture buildup

Condensation arises due to the change in temperature inside a vehicle. This is why you may have noticed some moisture droplets under your car's oil filler cap. The internal condensation, which usually takes place inside the crankcase, often happens on warm, humid days. However, this is not a normal occurrence among all vehicles. Condensation happens only inside vehicles that are rarely driven and often stored inside a garage. It is possible that the engine was not able to reach high temperatures, which is why trapped moisture accumulates as droplets under the oil filler cap. If you rarely use you're your car for everyday driving, make it a point to get it on the streets once or twice a week to heat up the engine and burn off the trapped moisture.

Stuck oil filler cap

If you cannot remove the oil filler cap from the reservoir, you may have over tightened it, or the threads did not properly lock. Over-tightening could break the cap, which will require you to purchase a replacement. Sometimes, this also happens when the engine is too hot that the cap is sucked in. However, everything returns to normal when the vehicle cools down.

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  • Keeping Your Audi A3 Oil Filler Cap in Tiptop Shape 27 February 2013

    Your Audi A3 oil filler cap plays a crucial role in keeping your engine oil clean, but it can also cause issues like oil leaks and poor engine performance when it becomes damaged. To make sure that your oil filler cap is always in good condition, follow these tips:


    Replace your oil filler cap's O-ring seal as often as needed.


    Your oil filler cap's O-ring seal can become brittle after some time. When this happens, the O-ring seal can develop cracks and allow oil to leak out of your engine oil tank. Check the O-ring seal for any cracks or tears and replace the component if needed. Be sure to grease up the seal with some lubricating oil before installing it.


    Go on longer trips.


    If you frequently go on trips that require less than 20 minutes of driving, you might find creamy white deposits beneath your oil filler cap. Short trips don't allow your engine to get hot enough to evaporate the water produced during engine startup, so make sure that you allow your engine to warm up properly before shutting it off.


    Ensure that your oil filler cap is tightened just right.


    A loose oil filler cap results in oil leaks and lets water or coolant foul up your engine oil. On the other hand, an oil filler cap that is too tight can lead to a damaged O-ring seal. Tighten your oil filler cap just right so that it sits snuggly on your engine oil tank.


    Don't spray water directly on the oil filler cap when cleaning your engine bay.


    Keeping your engine bay clean is a very good practice, but be careful when spraying it with water. Avoid using a high-pressure hose when cleaning your engine and try to avoid the oil filler cap as much as possible to keep water from seeping into your engine oil tank.


    Regularly check your oil filler cap for signs of damage.


    Visually inspect your oil filler cap for cracks, holes, or dents. If you have a metal oil filler cap, check for corrosion as well. Doing this quick and easy inspection can help you replace your oil filler cap before it leads to further engine damage.