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#42: 10-26-2010, 10:16 AM
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Just remembered I contacted Purolator about this a while back, the response from a product engineer was:
The relief valve setting would actually lower the rist of restrictive oil flow to the engine, at cold startups and when the filter gets to the end of its life. Some of our competitors use similar valve opening settings. If our valve setting was above the 23PSI, then I would be concerned about a possible problem