I used a mobile tire guy that used to work with my boss. He installed new tires on his Demon without issue. He came and mounted the tires, and charged me $130... My boss said he gave him a discount, so he'd give me one too. NOPE.
My tires were regular size and sidewall, nothing special.
Yeah, he F'ed up the balance on each tire.. He was there for maybe 20 mins, and I had to schedule 2 weeks ahead of time. Since this guy balanced tires on his Demon, and he goes up to 100mph frequently without issue.. I just figured he was good.
I busted my boss's nuts about that. Like, a lot.
I found a local tire shop through a wrench head I worked with also. 4 tires mounted and road force balanced, 100 $. Sometimes you just have bite the bullet and do it yourself. If that guy came to you and just changed the oil, he'd have to charge you for the oil at an inflated price to make money. I can't see how he'd make a profit unless his prices were high..