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The Toyota filter uses a unique pleat design. The media is folded over into six groups with pleating going all the way to the edge of the can. The element is really packed tightly into the can; it took a good tug to pull the element out. End caps are cardboard but very sturdily attached to filter media. The end caps have small notches to allow oil to enter the pleat groups.
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MEDIA Characteristics
Element Dimensions:
Purolator: 2.5” high x 2” diameter
AAP: Identical to Purolator
NAPA: 2” high x 2.25” diameter
Toyota: 2.5” high x 2-7/16” diameter
Pleats:
Purolator: 50 pleats; 7/16” pleat depth
AAP: 52 pleats; 7/16” pleat depth
NAPA: 50 pleats; 6/16” pleat depth
Toyota: 6 blocks of 10 pleats; approx 6/16” avg. pleat depth
Area:
Purolator: 104.6 sq. in. (46-1/2”x2-1/4”)
AAP: 108.6 sq. in. (48-1/4”x2-1/4”)
NAPA: 75.3 sq. in. (43”x1-3/4”)
Toyota: 135.4 sq. in. (57”x2-3/8”)
Thickness
Purolator: About 1/32”, slightly fuzzier than others
AAP: About 25% thinner than Purolator and feels somewhat more compressed
NAPA: About same thickness as Purolator,
Toyota: About 50% thicker than Purolator, with a slightly fuzzier feel than any of the others except the Purolator
Bypass valve
Purolator: The bypass uses a metal disk attached by a flat spring to the metal end cap at the closed end of the filter. Excess pressure will force the metal disk downward and allow oil to flow into the center tube. Purolator specifies the bypass pressure to be 14-18 PSI on this filter. Pushing down on the disk required a great deal more force than on the other designs and the opening created by doing so was very narrow.
AAP: Identical design to Purolator, I have no factory specs on the bypass pressure. Force required to push down on the valve by hand seemed identical to Purolator.
NAPA: The bypass valve is a separate module at the base of the filter. A ring of holes facing downward toward the inlet holes is backed by a rubber gasket in front of a metal disk. The disk is held down by a coil spring. If the pressure limit is exceeded, the disk is forced up, allowing oil to flow through directly to the outlet hole. With this design oil does not have to wash over the dirty side of the media to exit the filter like for the other designs where the bypass is on the closed end of the filter. Bypass pressure is specified as 8-11 PSI and the bypass was considerably easier to open by hand than with the Purolator/AAP. The opening area is also much larger than for the Purolator/AAP.
Toyota: Toyota uses exactly the same style of bypass as the Purolator/AAP. Due to the cardboard end-caps, a metal cap piece in the filter contains the bypass valve. Toyota specifies the bypass pressure as 14.3 PSI. Pushing in the bypass by hand required much less force than the Purolator/AAP, but it was still difficult to get the disk pushed down far enough for other than a very narrow opening.
