Re: GMC Brochure 1960-1961
I know at least for my 1938 Buick having no oil filter was a selling point. One less item to worry about, and it made maintenance a little bit cheaper/easier.
Again, this info is for my Buick. They had a super fine, floating mesh on the pickup tube. It would float to stay on top of the oil, where it was theoretically cleaner, while all the dirt and debris would settle to the bottom of the oil pan. If the pickup screen ever got clogged it was designed to collapse from the force of the oil pump, which allowed it to act as a bypass valve.
For a 60-61 GMC I would think the oil filter being optional is kinda like window cranks in modern trucks. Just a cost saving option for fleet trucks and whatnot. But that's nothing more than a guess.
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