I was working the pit at Jiffy Lube. Guy pulls in with a Dodge Intrepid clattering like crazy. Says he need to change the oil as his lease is up and he needs to turn it in. Same as OP, pull the plug and really nothing except a horrible stench. We added some fresh oil into it to try and flush it and sure enough nothing but chunks of grease like material. Manager was talking to the guy and he said he had never changed it, it was lease he didn't care.
Unknown to him the guy in the next bay overheard all of it, smelled the vile odor in whole shop and copied down the details. Happened to be he was one of the Dodge dealer/lease turn in guys that does the inspections and he was gong to document all of it as soon as he gets to work.
We had so many people question why I asked for an air hose in the pit and I told then that their spare tire only had 5psi in it and I just filled it in case they need it. they said they had never checked it, I explained the 1psi per month loss thing and temperature changes. Got some nice extra tips over the times as well as great reviews for the store.
One morning about 15-20 minutes before we normally open a nice looking young lady is waiting outside. Tapped on the door saying she really needed an oil change but had to get to work if there was anyway to get in early and we could do it quick. Manager asks if I'm OK starting early, no problem. He said we can do it but won't be able to do the vacuuming. She said fine please do it, and that she would vacuum it if she could use it.
So she's vaccuuming and talking to manager complaining how her boyfriend is an A-Hole and won't do this for her etc. I'm basically done with oil drop and new filter on, waiting for manager to do top side. I tell him he needs to come down to check this for me. He says just get it done I trust you. I say I REALLY need you to check this for me but he doesn't. Oh well I tried. He fills oil, did tires already gets her out and gone in under 10 minutes.
Then he asks what was so important and I smile and calmly explain that he really should have come down. If her boyfriend knew she goes to work wearing mini skirts and no underwear he might try a bit harder. She's going all around her 4 door car squatted vacuuming with her stuff on full display about a 2 feet away from me at face level. He was so pissed.