I have a B8 Audi A4, 2012, 2.0T. It's actually served me quite well and been one of the most reliable cars I've ever owned, not something you often hear about Audi's or about turbocharged engines.

If I'm going to keep this car for much longer (not convinced I will), then I want to make sure it's maintained well enough that I hopefully won't be left sitting somewhere. I keep up with oil changes and major engine failure actually isn't my concern right now. It will be going in to the shop for its first turbo replacement in January. The timing chain and timing chain tensioner was done around 72K miles. The water pump and thermostat have been done twice, the last time was about 1 year ago.

My question is, if I'm just going to start replacing parts preemptively, is that a dumb idea and what would I start replacing?

My idea is that I would replace hoses and belts, coils, starter, alternator, fuel pump, sway bar links, control arm bushings, struts/shocks, and O2 and MAF sensors. But then what about fuel injectors? Not to mention the air conditioning and cooling systems are aging now too. If I replaced everything I'm mentioning here, I suspect it could cost as much as the current value of the car, possibly a lot more.

So does it make any sense to replace common failure items to prevent future problems, even though it tends to get quite costly?