When a garage services a car, what is the information it has access to?
Obviously, by looking at the make, year, model, condition, it can already infer a lot.
Using the information displayed on the windshield or any stickers on the battery, oil cap, etc., the last service date of some components can be known / inferred.
Using the VIN, they can have access to a part of the history of the car (using carfax, autocheck, vehicle history, or similar services).
But is there any other source of information?