Oil Filter – A Dirty Oil Filter Will Obstruct The Flow Of Clean Oil

Oil Filters Displayed
Oil Filters Displayed

Your typical oil filter has to  perform a crucially important job.

The oil filter removes solid contaminants such as dirt, carbon and metal particles from the oil.

Consequently, before they can damage bearings and cylinder wall surfaces in the engine.

One of the biggest challenges that all oil filters have to cope with today is longer service life.

OEM-recommended oil filter change intervals for “normal” driving today can range from 5,000 to 7,500 miles.

Many vehicles don’t even have a recommended service interval and rely instead on a “Service Reminder Light”.

On some vehicles, the light may not come on for 12,000 to 15,000 miles depending on driving conditions!

That’s a long time for filters to remain in service.

Make sure that you change your oil and filter on a regular basis.

Since the development of engine sludge is directly related to how often you change your oil.

With Full-Flow Filtration the oil Is filtered before it gets to the:

  • Crankshaft Bearings
  • Cam Bearings
  • Valvetrain

It is an efficient way of removing contaminants and it assures only filtered oil is supplied to the engine. In time, though, accumulated dirt and debris trapped by the filter begin to obstruct the flow of oil. Since there is no way to tell how dirty the filter actually is, the filter should be changed according to the maintenance schedule in your vehicle owner’s manual, or when the oil is changed.

Though some vehicle owner’s manuals say filter replacement at every other oil change is acceptable, most professional technicians always change the filters at every oil change.

Why contaminate the clean oil with up to a quart of dirty oil. And why risk expensive engine damage if the old filter is on the verge of clogging up. A new filter is cheap insurance against premature engine wear.

Oil Filter Bypass Valve

To prevent a clogged filter from starving the engine for lubrication, filters have a built-in safety device.


When the differential pressure across the filters element exceeds a predetermined value (which varies depending on the engine application), the bypass valve opens so oil can continue to flow to the engine.

But when the bypass valve is open, no filtration occurs.

The bypass valve also opens when a cold engine is first started.

Cold oil can be fairly thick and may not pass through the filter element very easily.

So the bypass valve opens and allows the oil to go around the filter until the oil warms up. Contaminants that are in the crankcase bypass the filter. Consequently,  causing increased engine wear and possibly engine damage. Once the oil gets warm and the bypass valve closes, oil flows through the filter and normal filtration resumes.

Most filters look alike on the outside. But all filters are NOT all the same. There can be significant differences that affect both filtration efficiency and longevity. Some filters may contain up to 50% more square inches of filter media than a cheaply made filter. Which oil filter would you rather have on your engine? One with increased filtering capacity or one that may not go the distance?


A new filter is far less expensive than a new engine. Dirty or clogged filters allow contaminants to sail straight to your engine where they can cause damage. You also risk blocking the flow of oil to your engine, which could result in engine failure.

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