Back in the day when I needed service I would take my Mercedes 450 slc to an independent Mercedes shop! The guy was a master mechanic and treated me well! His process were far lower than going to the local Mercedes dealership!
Well He also passed on and the shop was sold to some young mechanics! They jacked the prices sky high!
I needed my brakes replaced! I ended up buying the rotors and the brake pads and taking my car across the street from where I was working to an empty lot and doing the work myself!! Turned out well!!
Yes -- my own shop-owner/veteran-mechanic had 50 years of experience when he retired last year at age 78. The "new" people are under 40 years old, and couldn't have that sort of hands-on experience.
In my continuing Trooper saga, they made good on the damage they did to my heater core. This was an all-time record, however, for the length of time my Trooper was in the shop. They knew they had to make good on their warranty, but to cut their losses, they tried to find a salvage heater-core. "Should arrive UPS day after tomorrow . . ." "I had to call them to push it forward . . . " "It should get here in a few more days . . . " Finally, the salvage part arrived, and it was an A/C evaporator -- not the heater core we wanted. I told them to order a new, $460 heater-core on a Friday, about 13 days after I'd taken the car in just to solve a minor transmission leak [succumbing to the pressure to replace valve-cover gaskets -- leading to all this . . trouble]. The part arrived on Tuesday, the Trooper was ready to go on Wednesday.
The shop-manager asked me while I was driving him back to the repair-shop, if I'd noticed that the A/C compressor belt was slipping. This was an ongoing problem I'd mentioned to the previous owner's partner two years earlier! Dousing the belts with spray-on belt dressing, it was not a major concern. But when I'd asked about belt-tension, the partner had said "there's nothing wrong with the tension, and the belt isn't worn." Another shop I tried last year suggested that the power-steering hose-leak we fixed had been "lubricating" the belt. But this wasn't true.
I checked the shop-manual, and there is a single 12mm-flat-to-flat "tensioner adjustment bolt" on the A/C belt-tensioner-pulley. I tightened it about one turn, and the squealing diminished almost entirely. I could only worry about the tension -- whether my adjustment would cause the belt to break or the compressor to seize up. The symptoms had always suggested a problem with belt tension as opposed to a failing compressor -- squeals on acceleration, or when the engine is cold. So right now, I'm keeping the socket wrench on my passenger seat as I fine-tune the adjustment by loosening the bolt a quarter turn here and there until the squealing becomes apparent.
These are minor things that lead to major things. If the former shop-owner's partner had just listened to me, or advised me of the possible causes, or SIMPLY ADJUSTED THE TENSIONER BOLT, I wouldn't be wasting time with this S***. And the moral of the story: YES! It's better to do your own maintenance and repair. These folks behave as though they're bad doctors, who wait for you to get really ill to collect a bill. One needs a repair-shop that works with you, without taking advantage of gaps in the customer's knowledge.
This is the down side of used/old car ownership, and this is why people shell out huge sums for new cars with drive-train warranties -- a big part of which depreciates by thousands of dollars just for "being out of style".
The up side, I can quantify. Over 17 years, I've saved about $14,000 in full-comprehensive insurance payments by shouldering the risk of damage to my Trooper when I'm at fault. The repair bills have always been a fraction of what you'd pay annually for new car payments. Of course, this costs me time reading the shop manual and fretting over the vehicle as I do.
In the old days, vehicles were simple enough that you didn't have to read 150 pages of the shop manual -- sorting through 2,000 pages just to find the 150 -- to get an idea of the work you might have to do. And doing things for the first time always carries a risk they'll be done incorrectly. That's why a 78-year-old mechanic with more than 50 years experience with an honest reputation is worth finding.
Don't hold your breath in your mechanic-search quest!