The NBC affiliate in LA did a three month investigative report on Jiffy Lube. You've got to see this very well produced video segment. The reporters made use of many miniature hidden cameras placed about the vehicle, proving that paid for work was not being done. Pure fraud at many different store locations (5 out of 9!). Includes confrontations with the store managers, and a district manager who lies about his own identity. Busted.
The KNBC web page has more background about the story (looks like the story ran last April or May) here.
Parts 1, 2, and 3 of the report are available on YouTube here. Is this company being run by Tony Soprano and friends? Or even worse, Reuters?