Bellow
Hardcore MB Enthusiast
Both DIY or garage servicing will generate an invoice/receipt for the purchase of the AdBlue. The absence of said receipt is a good reason to walk away from any car thus being presented for sale.Why? If the car is being serviced by a dealer every year, then you would trust them "to do what's necessary" - why would you assume that they did not top-up the AdBlue?
Obviously, if you service your car DIY, then this is a different matter.