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Tech Info
What's
the difference between a depth and surface oil filter?
The filter media in a surface type filter is pleated. Virtually all
contaminants in the oil are trapped on the surface of the paper. The oil
from the crank case enters the filter, flows over the surface of the media, and
as it passes through the pores of the media, the contaminants are trapped on the
surface. Microscopic pores in the media permit the oil to flow through
while trapping contaminants.
The filter media used in depth type filters is usually a controlled blend of
selected cotton thread and resilient supporting fibers. A migration
barrier is created by wrapping the media around the center tube of the
filter. Unique blending and processing tehniques produce a precise filter
media that does not pack or channel, and provides the flow requirements
recommended by the engine or vehicle manufacturer.
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