I have a habit, which I use also for motorcycles, that soon after buying I change motor oil and filters. I think it is good practice because you never know if seller done this when he/she intends to sell a car. So if I do not have a clear confirmation in the form of a bill, I usually do not believe the assurances of the seller and will do a "new opening" that is, replace fluids and filters. I did it a few days after the purchase of Mazda.
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