first off on the comment from smart fella.. you do not need a landline, just make one up. here in Hartford, ct i use 860-524-8123 that number is a legit working number..,albeit it is for the time ! but i have used it for many years when they want a phone number.
as for $80 full synthetic oil change..you can buy a 5 qt container of mobil one and an,oil,filter at walmart for under $30.
thats full retail...your guy probably pay $20 so he is making a fortune off you !

ascforcflatvrepair..town fair tire does it free no need to pay $80 for oil change