The only time I ever went to a "Econo Lube & Tune" -type oil change place, about 15 years ago, I had replaced my air filter myself the night before. The clown pulled it out and waved it in front of me to "prove" how dirty is was, and that I needed another. (It was brand new.)
The last time I was at my local GMC dealer, I saw them doing the "wave the filter theatre" for some customers - I'll need to be wary when I go back there for my truck. (too big for me to do myself.)
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 1965 Pontiac LeMans. M21, 3.73 in a 12 bolt, Kauffman 461.
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