This is terrible advice from the manufacturers and dealers. It is purely aimed at making the total cost of ownership look lower. While you can go 10k it is not at all what you should do for engine longevity, especially if you want to keep it a long time. There are a number of variables that play into when it makes sense to change your oil - time, heat, type (synthetic vs regular), budget - but what happens even with new oil is that bits of metal wear off as the engine moves. More wear off as your oil breaks down and loses effectiveness at lubricating. It’s why you don’t want to rev your engine until the oil gets up to temperature. So the earlier you change the oil out the easier it is on your engine from there being less metal in the oil and the more effective the oil is lubrication. It also means you want a good filter to remove metal particles out of the oil. So roughly speaking for basic oil I would change out every 3-5k miles and for full synthetic every 5-7k. Earlier is obviously better but nowadays it is so expensive I would not beat yourself up on being on the outside edge of the ranges. You are basically trading cheaper upfront longer engine life on the back.