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Bypass Oil Filters











How Does a Bypass Filtration Work?

Bypass motor oil filtration incorporates a secondary oil filter that is designed to remove virtually all contaminants from motor oil. Bypass filters have a high capacity and remove much smaller particles, including soot, than full-flow filters. While bypass filters reduce engine wear and increase oil volume, their high efficiency also means that they have a higher restriction and must be used in conjunction with a full-flow filter. Invest in high quality bypass oil filtration systems and keep your motor running smoothly and more efficiently.

How Bypass Filtration WorksBypass filters work on a “partial-flow” basis, filtering oil. They consume about 10% of the oil pump’s capacity at any given time and trap extremely small, wear-causing contaminants that full-flow filters cannot remove. Bypass filters have a large pressure differential, which causes the oil to flow very slowly through them, allowing for the removal of finer contaminants.

Bypass filtration is so named because oil flows back to the sump through the bypass filter, bypassing the engine. This continuous process eventually cleans all oil analytically, reduces long-term wear, and significantly increases oil drain intervals.

Click here to view a video demonstrating the performance of AMSOIL Bypass Filters in diesel engines.

Full Flow Filter vs Bypass Filter

Because full-flow filters are more open and free-flowing than bypass filters, they can accommodate the flow of engine oil. They are less efficient at removing small particles due to their free-flowing nature. AMSOIL Ea® Full-Flow Filters are capable of removing particles as small as 20 microns.

At any given time, bypass filters filter only a small percentage of the system’s oil. Denser, more efficient filtration media facilitates the removal of small particles. Ea Bypass Filters efficiently remove contaminants down to 2 microns (98.7 percent efficiency).

When used in conjunction, full-flow and bypass filters protect against both large and small particles, as well as short- and long-term wear. Additionally, filter capacity is increased and filter life is extended.

Why Bypass Filtration is needed?

The majority of engine wear is caused by particles ranging in size from 5 to 25 microns. (The term “micron” refers to the abbreviation for “micrometer,” or a millionth of a meter. For comparison, a human hair is approximately 75 microns in diameter). The issue is that the average full flow filter is only effective for particles 20 microns in diameter or larger. This means that all particles smaller than 20 microns can pass through the filter and cause engine wear. This is where a BYPASS SYSTEM FROM AMSOIL comes in handy. Installing a Bypass System on your vehicle effectively filters particles down to the size of two, thereby reducing engine wear.

AMSOIL Ea Bypass Oil Filters offer the highest level of protection against wear and contamination. AMSOIL Ea Bypass Filters work in conjunction with the engine’s full-flow oil filter to filter oil on a “partial-flow” basis.

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