Flow Area Characteristics – Attempts to show the various flow restriction points as the oil flows through the filter (aside from the media itself)
Base Gaskets
Purolator: Rectangular profile held by six crimps
AAP: Identical to Purolator
NAPA: Rectangular profile held by eight crimps, a bit thicker than Purolator
Toyota: Rounded gasket held by 12 tabs. Seems like a stretchier and softer rubber than on the other filters. There is a clear grease between the gasket and the filter base.
Denso YZZA1's are great!
Not to flood, but when you're talking oil filter compairo's, 3/4 pics a thread just can't cut it!