Neither. Your car is on a software-determined mileage schedule. For some cars it’s 3000 miles, some 3750, some 5000 etc. Even if you changed the oil today for fresh oil, it would still show you 10% oil life left in the car, – until this software trigger is reset. You can Google your car and “oil service reset” to see how to reset the notice if you’re curious, but the garage doing the work for you will know and should reset it for you upon the work’s completion.
Now, your oil is potentially contaminated from use to some degree, but it should pretty much all be there unless you have an oil leak. You can check your oil level yourself very easily using the dipstick under the bonnet/hood.
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