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Rookie oil filter question 700

"The Volvo oil filters have a spring loaded bypass that closes when the engine shuts off to prevent dirty oil from getting back into the engine. Bosch is probably the best of these,..."

Simply not true. It appears you are confusing the bypass device with the backflow device (ABDV). The abdv is not spring loaded in the Mann, nor any other commonly available oil filter that know of. The ABDV is a rubber or silicon flapper that slows the reverse flow of oil after shutdown. The bypass device on the other hand IS spring loaded (coil or sheet metal) to allow (at a preset pressure delta) to allow oil to by-pass the filter element.
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http://www.fidalgo.net/~brook4/oilslubesfilters.html






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