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Old 08-31-2001, 11:51 AM   #30
Scooby Specialist
Member#: 1575
Join Date: Jun 2000
Chapter/Region: South East
Location: Atlanta GA, USA
2011 WRX Premium
Blackest Black



It's not the drainback valve people are talking about (which really wouldn't matter because of the filter orientation) It's the Bypass valve which is specific to each vehicle and application. this valve opens when the filter becomes clogged so as not to starve the engine of oil. Depending on the oil pressure in your car a lighter valve (than stock) could allow constant bypassing of the filter or a heavier valve could never open until the engine is already starved for oil.

BTW the Purone uses synthetic filtering media and a better ring seal and in all other respects is exactly to factory specifications.
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