A few years back I was tasked to price out all four calipers,a master cylinder ,& all the brake hoses on a new Saab.It seems that the owner had been to an instant oil change & the ,um.."tech"had topped off the break master cylinder w/engine oil.All the rubber parts in the break system eventually swelled & the brakes just went away.
IIRC,it ended up about a $4k mistake after the lawyers got envolved.
Then there's the Cavalier engine from the stripped oil drain plug & all the air filters,rad caps,ps pumps,grrrr.
It got to be a joke.a too well dressed individual walks into our store w/a invoice in hand & says"I need this,this,&this."Priceless is the look on their face when we'd ask what instant lube they just came from.
Shysters,says I.