I wouldn't bother with keeping to X-part. I do think that a stamp from some sort of garage is all that would be looked for with regards maintaining a decent value, or at least a receipt showing date and mileage.
Most dealers around my way do all make servicing and would be well under that quote.
Personally, I'm wary of people who claim to do their own servicing when it comes to buying / selling. That is not meant at you .... just a personal view.
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