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Well I'd suggest a second opinion that is not a dealer. I took my car in for an oil change once and when it was time to pick up the car they said my rear diff was leaking and it would be $3700 to replace the sealing rings. I took it home instead and looked underneath and there was a tiny bit of weeping which I wiped with a paper towel, no leaks then and no leaks since ~5k miles. So you should understand the dealer service advisors are basically car salesmen in that they are paid on commission. Not saying you don't have to worry about it, but saying you should check with someone not incentivized to get work done to feed their family.
Finally, having to add oil between oil changes is normal from my own experience and what I've read.
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