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On another board, someone has tested and discovered that the Wix filters being made now have a leaky ADBV, not the valve itself but the swaged metal disc that connects the mounting to the outer cannister https://www.v8buick.com/index.php?threads/buick-oil-filters.381367/#post-3352618

Sensational headline I know but some of that was my fault. I have a 1970 BBB that I had finished and put it on an engine dyno for testing. Had 10W-30 conventional VR1 with a can of GM EOS added for break-in and remained in the crankcase for the duration of testing. Made a large number of pulls...