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I learned many guts of filters come from the same exact place. After being the grimy pit lube guy for a year or so and thousand of vehicles...I found the difference in weight between a new fram with the "extra" be it startup filter or 99% filter and whatever else they got..were the heaviest as dirty filters...upon tipping upside down into the pan, they let out the least. That says it all..I still let the valves smack on the old sube to a 99% fram filter,altho I would use anything that claimed it. it takes a few seconds/minutes longer to close pressure relief for the 99% filter, in the long run it is just that: a looong run.
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