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Most, if not all car companies collect and profile your data, how can I improve my privacy when buying a modern car?
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Won't the dealership also send all the now only locally stored data to their servers anyway (even if they don't fix the connection, just automatically by plugging in OBD)?
That's how that happened before always-online cars (pre 2010).
They might, I don’t know. But I don’t go to the dealership anyway and wouldn’t recommend it to anyone.
That depends on the brand and location (& in some cases even warranty tos, lol), manufacturers licence & maintain ~~dealerships~~ licenced mechanics/shops differently. It's (maintenance costs & quality) an important aspect of owning a car.
But generally, yes.
Tho non-official shops sometimes connect your car to the mothercloud too, depending on what needs servicing.
Never buy a new car. That's half the problem. I refuse to ever take a car to a dealer.
Rule 2 of car ownership: never take it to the dealer for maintenance. Find a local shop and build a relationship with them.
Rule 1 is never buy a new car/buy a car from a branded dealer. Cars lose up to 30% of their value when first purchased. Several years ago I bought a 3 year old car for half it's new value - that's how much they depreciate (a Honda no less). Brand dealers are pros at screwing you over.