George, that Purolator DOES have a pressure relief valve. You do know that not all filters have a pressure relief valve that is visable from looking in the can, dont you? Just because you cant see it, dont mean it isnt there.
I think the old AC Delco filters had a pressure relief valve by the threads of the can and it looked like the anti drainback valve. The valve did both though. Read the old mini mopar site and he shows an old AC Delco filter from 1999 (they have changed now but its worth looking at since it shows that valve type). http://www.minimopar.net/oilfilters/index.html
Quoting Removed, click Modern View to see
Cut your used filter open, that would be the only way to find out for sure. Usually a OEM filter is contracted out every couple years, sometimes even more often than that. There would be no easy way to tell who made the filter without cutting it and there is no guarantee that it will be the same as the ones on the shelf right now. Thats why I recommended that you cut open a filter and if its to your liking, buy that vehicles life span of filters now because next year, they could be made differently.
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