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I'm sure filters being screwed down rather than nice little clips is a two part decision and it has nothing to do with protecting your interests.
1. Cost. Robots can essentially do screw jobs, and screws cost less than clips.
2. Deters people from replacing their own filter and taking it into a dealer. Anything that requires tools will deter a certain percentage of people over the same job being done without tools. That == money for dealers.
But seeing as how this is chevy and not bmw, i'd go with #1 as being the driving force.
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