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I've had a Volkswagen Passat for a little over a year now, and it's been driving without any major issues so far. However, I've noticed the ride feels just generally "worse" that it did before.
Everything I've noticed makes sense considering I've put about 15,000 extra miles on it: the engine is a little bit louder than it used to be (especially when I first start it), the car vibrates a little when idled when it didn't used to, and a few other small things that I'd expect to come with use.
While none of these are urgent or major problems, I can't help but feel they're indicators that something urgent or major is on the way. A louder engine or an engine that vibrates more than usual seems to me like a symptom that something isn't working as well as it used to, and I'd really rather not wait for something to go wrong before getting it looked at.
I've gotten the oil changed, brakes checked, tires rotated, etc. regularly, but without being able to pin this vague behavior on anything specific, I don't know how to ask to get it looked at. What I really want to do is to have someone check over everything and make sure it's working like it should be, and that there are no impending issues on the horizon.
Is this reasonable, and if so, how do I go about doing this? This is my first car, and I'd like to keep it healthy for as long as I can.
(NOTE: I'm also a little worried because I don't know much about cars, and it feels fiscally irresponsible to say, "hey, can you find literally anything at all wrong with my car? I'll probably pay for whatever you tell me is wrong because I don't know any better." Whichever approach I take, I'd appreciate if I were somehow protected against that.)