Sounds like another enduring Packard mystery for the ages. My comment that the filter was included on Clippers was based on the specifications in the Service Counselor. I assumed (perhaps mistakenly) that the statement indicating it's location meant it was present. Perhaps they meant that as "there it could be", not "there it is".
Again a bit off topic, but below is a photo of the engine compartment of the Pebble-winning 1934 1108 Dietrich just finished by Automotive Restorations in NJ. This is about as perfect a restoration as you could ever see. Note the bypass filter on the left side of the engine; the full-flow L-8 filter in following years was located on the opposite side of the engine. I believe the oiling system was revised concurrent with the increase in displacement from 445 to 473 cubic inches that occurred at the same time.
PS - just a personal opinion but I think the Dietrich looks so much more stately and reserved by not being all gussied up with Trippes, sidemount mirrors, etc.
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