Clearly Fram took the design of using "nubs" on a fiber end cap instead of an octagon shape from Champion Laboratories, viewing this pristine Gen 1 pre-Frampion Ecore filter.
I'd use it on my OPE. I ran plenty of Gen 1 Ecores last decade on my prior truck when I lived in SE Louisiana without incident, with conventional 10W-30 in a Dodge 360 engine.
"No matter how paranoid you are you're not paranoid enough. Tell the truth. Reach as many people as you can with it. That's your weapon." - Susanne Modeski, aka "Holly" to The Lone Gunmen