<prompt> Human: Im not 100 on how car depreciation works. Assuming shell eventually flick it off on her own not going through a dealership how long will she need to own it to minimise the loss in value?The car is worth around 42000.Its on 60 month term at 3 interest p.a.She paid zero deposit.Shes paying 760 per month.I have no idea what the cars value is used.Its a 2017 Nissan Qashqai, if that helps.She intends to hold onto it for 15 years.Assistant: Well it will probably never be an absolute waste of money. Certainly, buying a new car isnt always the most financially optimal thing to do, but if you went through your life only doing the optimal things you would have a very sad life indeed. Assuming shell eventually flick it off on her own not going through a dealershipNot sure what you mean by that?Human: Yea thats true. And it is something shes been wanting for awhile. I just didnt think at this stage in her life it was a fiscally responsible decision. Shes in minimal debt but doesnt earn that much to justify the purchase I believe.I mean sell it secondhand on her own rather than selling it to a secondhand car dealer. That way she can maximise how much money shell get for the car.Assistant: I just didnt think at this stage in her life it was a fiscally responsible decision. Shes in minimal debt but doesnt earn that much to justify the purchase I believe.Well - thats kind of her decision to make. If you tried to steer her away and she decided to do it anyway its not really your business now.There isnt a magical formula for how much it will be worth in X years. Hold onto it as long as feasible and your overall cost over time will go down!Human: Youre 100 correct. I just think as this purchase affects both of us in the future joint incomes I would be amiss to not at least offer her something tangible to think about or consider about her purchase. However at the end of the day the decision is hers.Thanks for your response.  <response>: Youre playing a dangerous game of control here. She clearly sees this entire situation differently than you. Youre planning for a marriage that hasnt happened and in the process making it less likely to happen. If she can swing it, deal with it when youre married or when its an actual problem. She clearly doesnt see this as a problem and wont appreciate your solutions. The contract is signed so there is nothing that can be done for several years. Deal with it then. 