The optional filters are indeed bypass filters, not full flow from the oil pump. Eventually virtually all the oil passes thru the filter, but it would take a while, with only 7-12% each pass.

Just change the oil per the original recommendation, and it'll be fine.

I have one that came on my truck, so I'm putting it back on.

Kevin
1951 Chevy 3100 work truck
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1929 Ford pickup restored from the ground up. | 1929 Ford Special Coupe (First car)
Busting rust since the mid-60's
If you're smart enough to take it apart, you darn well better be smart enough to put it back together.