My last visit to Jiffy Lube was in a pinch. I was already behind schedule and had a 600 mile drive ahead so thought I'd save a few minutes. I recall the caring service writer recommending I change diff lube for a small fee. He gave some line about how few of us 4x4 owners remember to handle front and back, which explained the poor condition. What he didn't know was I'd just changed it myself the day before after checking wear patterns. Buffoons. When I mentioned this he stopped cold. Didn't even try to sell me one of their famous 3000mile air filters. 
There was a set of these in California caught using old oil. They'd drain oil from customers and filter it into their fill tank each night.
Shady service centers thrive because somewhere over the last few decades it became unfashionable to know about cars. Ignorance makes one easy prey.
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There are a vast number of people who are uninformed and heavily propagandized, but fundamentally decent. The propaganda that inundates them is effective when unchallenged, but much of it goes only skin deep. If they can be brought to raise questions and apply their decent instincts and basic intelligence, many people quickly escape the confines of the doctrinal system and are willing to do something to help others who are really suffering and oppressed." -Manufacturing Consent: Noam Chomsky and the Media, p. 195
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