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There is some truth to this. A mechanic's car is their CV. what they drive, how they drive, tells you what they are about. regardless of their income, or years in the game.
It sounds like I'm screwed then because my mechanic rides his bicycle to work.
Are they just following protocol? or are they actively students of the art?
To be more serious, I think you are freighting a mechanic's job with some level of artisanal romance that's not uncommon on these fora. Sure, sometimes a car has a mysterious issue or a delicate area that requires specialized knowledge and experience, but for the most part, car maintenance across marques and models are more alike than not.
My BMW just went over 189k miles, of which the first 100K were dealer maintained, and the remaining maintained by an independent. It also has something like 5000-8000 track miles on it as well as some of my own shadetree work (brakes mostly), and is a daily driver. I change its oil and filter approximately every 7500 miles, give or take (usually give) throughout its entire life, using synthetic 5W30 of different brands, mostly depending on what my mechanic has on hand.
It still has its original clutch, and has had the usual E46 issues, but aside from a leaking head gasket, nothing oil-related has ever happened to the car. The engine does not consume oil nor does it leak any of it. I don't know how much power it makes these days, but it still gets the same mileage around town and on the freeway as it did when new. I try to do sensible maintenance on it, but don't stress if I happen to miss an interval by a little bit.
The last things I did to it were to replace its driver side mirror (my idiocy) and the throttle pedal whose plastic hinge broke. I'm frankly amazed that hinge, which is just a piece of thin plastic with a fold creased in it, lasted so long.
Air filter- the cheapest worthwhile performance upgrade you can do.
Nah. It's a great way to mess with your engine though if you're not on top of its maintenance.
Brake pads- Do you want the cheapest blocks of wood that OEM offers? or do you want to really stop when you need to? It goes on.. .
For the kind of cars we talk about here, OEM brake pads are very good especially BMWs and Porsches. The only reason to go 3rd party is either to reduce dust or if you are a good enough track driver to stress your brakes (and I don't mean by misuse as most track n00bs tend to do). There is good reason though to use better brake fluid than OEM if you track. Fluid and tires are the best ways to upgrade your car's braking performance.