Its not so much the quality of the oil that I worry about at the quick (Jiffy) lube places. I'm more worried the oil change guy making mistakes. Also very worried about their own brand of oil filter.
I once went to Jiffy Lube to ask what they use for an oil filter. They showed me their own brand. I said I wanted a name brand, like motorcraft, AC, etc. They told me, "well our filter is MADE BY FRAM" like that was a good thing. I then asked, if it is made by Fram, why does it not say Fram? Needless to say, I did not get my oil changed there that day.
Another thing that bothers me, another time, I took my "third" beater car to a quick lube place. Not knowing any better, when they asked me for my name/address, I gave it to them. After that, they were always sending me notice that my car was due for an oil change. If I ever go back to a quick lube (doubtfull), it would only be with a car that is not in warranty, plus I would make sure that they used a manufactures filter (Motorcraft for Fords, A/C for GM, Mopar for Chrysler) and I would not give my name/address, telling them this is a cash purchase.
Another thing. They are always trying to sell you things you don't need. Show you the air filter, spread the pleats, saying that the filter needs to be replaced, even though the filter is really clean and just doing its job.