9 psi difference in oil filters!

[SnS C10]

Just thought I would put this out there for you to know. Im running rotella 15w-40 oil. With the fram tough guard tg5 filter upon cold start with the engine sitting cold since yesterday afternoon, my guage read 21 pounds at idle. Went to the store, grabbed an acdelco filter, filled it with the rotella oil. Took off the tg5 and screwed on the ac delco. Started the engine and the oil pressure read 30 psi at idle. Ive heard of fram causing lower oil pressure but I was shocked to see this! Hope this helps some of you out there!
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