How Often Should The Oil Filter Be Changed?

How Often Should The Oil Filter Be Changed?

Every time we do maintenance on the car, we have to unscrew and replace a cylindrical iron canister on the car. This is the oil filter we are talking about. It is replaced with the oil.

So, how often is it better to change the oil filter? How long is its longest life? How often can we change it for the longest time?

Before we understand this problem, let's first understand the structure and principle of this oil filter.

Today's oil filters are basically spin-on oil filters. A round metal box on the outside is wrapped with folded filter paper. This filter paper is the core material of our machine filter. The current machine filter paper is After heat curing, it has a certain degree of hardness and strength. Unlike our ordinary paper, it can withstand oil pressure and is not easy to deform.

The oil filter is screwed into the middle section of the oil circuit. The bottom is the oil pan and the top is the engine.

Its main function is to filter impurities and dirt in the oil, provide clean lubricating oil for the engine, reduce wear and extend the life of the engine.

The oil filter works like this. It has an oil inlet and an oil outlet. The oil in the oil pan flows into the filter from the oil inlet check valve, and the dirty oil that flows in is on the edge of the filter, on the outside of the filter paper. , And then filtered through filter paper, the clean oil flows out from the center of the filter and sprayed onto various parts of the engine.

This is a normal working process, but there are some special circumstances. For example, the machine filter takes a long time, and the filter paper of the machine filter has too many impurities, which blocks the filter paper holes, which will cause the amount of oil to flow out. Smaller, less oil enters the engine, which will affect the lubrication and operation of the engine.

In fact, at this time, in order to ensure the amount of oil flowing into the engine and maintain the oil pressure, there is a spring valve at the bottom of the oil filter, called a bypass valve, which will automatically open to let the unfiltered oil flow from the bottom valve. Go in, merge with the oil in the center of the filter, and flow into the engine together, but at this time, the mixed oil is oil with impurities.

Okay, let's go back and say, how long can this machine filter be used?

In fact, the quality of the machine filter is not a problem, and the filter paper will not be deformed due to oil pressure and soaking in a short time.

However, the service life of a machine filter is mainly judged based on its filtering capacity, not its own quality.

If there are too many impurities and grease stains in the oil, they are attached to the filter paper, blocking the filter holes, resulting in lower oil pressure, and allowing the impurity oil directly into the engine, which is equivalent to the oil not being filtered. In fact, at this time It's time to change the filter.

Therefore, the replacement of the filter depends on the cleanliness of the oil.

Let’s take an example. For example, we changed the oil and filter element. If we did not change the oil during maintenance for 5000 kilometers, we only changed the filter, but the time for the new filter will not reach 5000. Kilometers, maybe 2000 kilometers, 3000 kilometers will be replaced, because the old engine oil has more impurities than the new engine oil.

Therefore, in most cases, the service life of the oil filter is 5000 kilometers, and it is aimed at new oil.

However, some friends may drive relatively few cars, maybe only 3,000 kilometers in half a year, but at this time the oil expiration date is up, it is time to change the oil, generally we will also change the oil filter together.

Therefore, here is a summary. In most cases, the machine filter is changed every 5000 kilometers, but if it does not reach 5000 kilometers, as long as the oil is changed, the machine filter is generally replaced. The price of a machine filter is only ten or twenty yuan. We don’t feel distressed if we change it more. After all, it is good for the engine.

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