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Mercury Monterey Throttle Body

Knowing the Reasons behind Your Faulty Nissan Xterra Oil Filler Cap

Your Nissan Xterra oil filler cap serves the very important purpose of keeping your engine oil in its proper place. You might not expect much damage to ensue from the breaking of such a small component, but a faulty oil filler cap can actually cause serious harm to your Xterra's engine. Avoid engine trouble by taking note of the following oil filler cap issues:

Engine oil leak

If your Xterra has developed an engine oil leak, you probably have a loose, cracked, or excessively tightened oil filler cap. Take a look under your hood and examine your oil filler cap for signs of wear and improper fitment. A loose oil filler cap might not be able to hold the pressure inside your engine oil tank and allow your engine oil to spill over. However, make sure that you don't tighten the oil filler cap too much, or you will risk damaging the O-ring seal and end up with an engine oil leak anyway.

Creamy, white deposits on the oil filler cap

Look at the underside of your oil filler cap and check if it has any white or cream-colored sludge. This light-colored buildup is a usual result of water mixing with your engine oil. While this is harmless for the most part, it can also mean that you have a cracked or worn-out oil filler cap. While replacing your oil filler cap can offer a temporary fix for this issue, you might want to check for any faulty engine components, such as a blown head gasket, that might be causing moisture to enter your engine oil tank.

Other troubleshooting tips

Any odd-looking substance buildup on the underside of your oil filler cap is not a good sign, and if the buildup is dark-colored, you need to take your vehicle to a professional for better diagnosis. A quick visual inspection on the oil filler cap will also tell you if the component is too worse for wear. If you notice any cracks, holes, or other deformations on the oil filler cap, then it's definitely time for you to get a replacement.

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  • How to Get the Most out of Your Nissan Xterra Oil Filler Cap

    Your Nissan Xterra oil filler cap is a small but tough component that is designed to handle the pressure that builds within your engine oil tank. However, exposure to constant heat and pressure can still weaken this component in the long run. From an engine oil leak to a completely busted engine, a damaged oil filler cap will definitely cause a lot of problems for your Xterra. To ensure that your oil filler cap always does its job well, follow these tips:


    Keep your oil filler cap clean using brake cleaner.


    Cleaning your oil filler cap with brake cleaner on a regular basis is the quickest way to get rid of the white sludge on the underside of your oil filler cap. However, cleaning it alone will not take care of the entire issue. Make sure that you also check any defective component that is causing moisture to mix with your engine oil.


    Take longer trips.


    Among the probable reasons for water making its way to your engine oil are really short trips on your Xterra. A short trip won't allow your engine to get hot enough for the moisture to evaporate, so make sure that you let your engine warm up for several minutes first before turning it off.


    Make sure that your oil filler cap is tightened just right.


    A too loose or too tight oil filler cap is one of the most common sources of engine oil leak, so make it a point to securely tighten your oil filler cap whenever you go for an engine oil service. Using your hand, tighten your oil filler cap as much as you can. Don't use a wrench to tighten your oil filler cap since you might damage the O-ring seal with this method.


    Regularly check your oil filler cap for cracks.


    Even a very small crack on your oil filler cap can allow moisture inside or engine oil outside of your engine oil tank. Make it a habit to perform a visual inspection on your oil filler cap, and replace it immediately if you notice any deformations.