I fell victim of Jiffy Lube too. I had a 96 Sunfire GT that i usually changed the oil on myself.... I took it to Jiffy LUbe one cold winter day, no garage and they did an oil change check all levels etc.....
everything was fine, or so i thought... about a year later, yea a year, the transmission blew. i took it to a tranny shop, they said that the dipstick was gone and that the tranny juice just slowly sputtered out. he said it happens alot with instant oil changes and i said i change my own oil. i said i went to one but it was a year ago... he said that is possible.. due to so little dripping out at a time that it would take that long before it ran dry. He showed me where the dipstick should have been and how its removed. no chance it could have come out on it's own, nor that i have ever taken it out.
Of course try to prove this. so i was stuck.... screw that jiffy lube. I always change my own oil now, or go to the dealer. and when i change my own oil, i put it in a milk carton and drop it off on jiffy lubes front steps, when they are closed. Screw them. they can dispose of it. since they are in the hole to me for a grand, in my book anyway.
Mike