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.
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.