Oil loss the second. or How do I find the right workshop?

Moin, what a year. Brakes made in the back. 600,- EU. Valve burned away. That and a few small things 1,800 EU. Car from the Wekstatt. Tube of the oil trap shaved off and loses oil like the sow. Again. Exchanged a sealing ring and patched the hose. Apparently OK. After a few days under looked. And look, an oil stain. Workshop explains that this is an unfortunate coincidence that he loses oil so shortly after the repair. Since “you have not been at all”. “But that could look at itself again”. Otherwise I could “turn in a bottle of such oil leak stopper for the first time”Old cars are never so dense. A bit of oil always sweats them”. Sweating? In front of my garage it looks as if the Exxon Valdez was stranded there. Before the valve repair it was dry. Is it so hard to get an engine close? So slowly I have the feeling of the Volvo is not the right thing for me. With the workshops I have only bad luck and myself I can’t do enough to keep the box running. If I drive into the workshop, I always have to convince the master that I want to have the car repaired and that I don’t want to buy another one. Two workshops have explained to me that they don’t like to accept such old cars, because you “never know if there are any parts at all. I don’t want to say (better) the money doesn’t matter. But I would also take money into my hands if it were okay afterwards. All the workshops I’ve tried so far were recommendations from acquaintances. But they have “standard cars” a ́la Golf or Ford. I didn’t have him in the workshop once without having to complain afterwards. From parts that have remained in the workshop over huge oil stain on the new floor mat until the present oil disaster everything was there. I have only bad luck or have other also the problem to find the right workshop for a Volvo? How have you come to “Eurer” workshop?