Jiffy lube upsold me transmission fluid change. They caused a slow leak on the fitting they pulled a hose off to change. Then denied responsibility. I had to go somewhere else to get a new fitting on to get this fixed. I'd stick with transmission specialists or your own mechanic, not a drive-by place like this..
They also tried to upsell me on differential change. Ez lube put wrong fluid in friend's jeep and caused him a little later to spend $1400 to replace rear differential.
If you can avoid the upsells they are handy. I've had one place forget to put trans dipstick back in and had to drive back to get it.
Another place Econo-lube put the oil filter on loosely. Soon as I started car the filter and all the oil came out. I'd brought in my own synthetic (these places have it now) so had to buy another $20 of it :(
Another overfilled my small car's oil. most places do this regularly because oil level is lower warm. is BAD for your car, not always terribly so..
They tell you not to overfill for a reason. It immediately broke the oil pressure sender. Of course they deny responsibility for it.
On my van, which had an 'open sump' boxer engine, overfilling alot results in oil seeping into combustion chamber thru the top, so thick white smoke comes out the back. And if not quite so much then the smoke comes out only when driving up a steep hill. Not super bad but probably gunks up something a bit.
It was almost funny last time.. they checked all my fluid levels and gravely told me that the windshield washer fluid was low, all they could find :)