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Jeep Wrangler Hood Bumper

Lexus ES300 Oil Filler Cap Diagnosis Tips

The function of the oil filler cap in your Lexus ES300 is pretty simple: it ensures that the oil stays inside. However, this small function is very important of the performance and safety of your vehicle. If it gets broken, your car, specifically your engine system, is going to suffer a lot. Temperatures inside are going to rise extremetly fast, and could lead to worse problems. If you want to make sure that your car stay safe, then you should be wary of the problems and causes regarding your oil filler cap:

Oil leaks

A very common symptom to know that your oil filler cap is problematic is when you are having leaks. Most oil filler caps are made out of plastic because of its low construction cost, as well as being very easy in manipulate and shape. The problem with this material is that it is very easy to get damaged. The sources for the part's harm are the pressure coming from under the hood and prolonged usage. In time, areas of the oil filler cap will start to crack, or the threads in the screw will slowly fade away. If ignored further, the part will fail at its job of making sure the the oil stays inside,and would eventually spill out. Some oil filler caps are made of metal, which are more durable. However, corrossion due to rust is the issue that is prevalent for these type of parts. In any case, always do an inspection of the oil filler cap and see whether or not there are any cracks or holes visible.

Engine troubles

Another sign that you should get your oil filler cap fixed is when you are expereiencing subpar performance in your vehicle. These could come in the form of either overheating from your car, a decrease in fuel efficiency and mileage, or a sudden breakdown of the entire vehicle. Lack of lubrication is going to generate a whole lot of friction between the moving parts of the engine. This heats up the internal components to a dangerous degree, and could cause a dangerous situation wherein the car could blow up in the middle of the road, leading a road accident.

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  • Easy Lexus ES300 Oil Filler Cap Maintenance Manual 27 February 2013

    The Lexus ES300's oil filler cap keeps the fluid inside your vehicle, preventing any waste that could be caused by leaking. A broken oil filler cap can be troublesome in the long run. Thus, proper maintenance of the car part should be included in your regular routine. To help you with this, here are some maintenance tips for you to get started:


    Check oil filler cap for damage.

    For oil filler caps, it is extremely vital that there is no way that oil is going to be able to spill out. Thus, when doing regular maintenance for your vehicle it is important that you also check the oil filler cap, not just the main car systems. See if there are any cracks, holes, or rust if the cap is made out of metal. The mere pressure from the vehicle could easily wear down the part, so it is good that you are able to see the problem before it gets worse.


    Clean oil filler cap regularly.

    Just like other car parts, a clean oil filler cap is a good maintenance measure to keep your vehicle safe from any major trouble. A good thing about this is it is just a rather simple procedure. All you have to do is take a clean rag, dip it in water mixed with soap, and just rub the part. Make sure that you are able to take out all signs of dirt, grime, and debris visible. Just remember not to rub it too hard, as you might suddenly crack the part, forcing you to replace it instead.


    Do not put oil filler cap on too tightly.

    Not only do you need to be careful in cleaning and inspecting the oil filler cap, you also need to be cautious when reinstalling it. There is either a screw or a spring installed on the cap that holds in it place. Putting too much force on it when screwing could result in the threads wearing down, or in the case of springs, suddenly snapping off the cap. So, always remember to just put on the oil filler cap gently and do not overturn it.