Personal preference for an iPhone or Android smartphone could soon dictate the car choice of younger buyers, predicts Glass's.
The publishers of the trade pricing bible say motor manufacturers are already working with Apple or Google on next generation systems that will see smartphones, tablets and cars integrating much more closely, giving drivers greater access to information and apps.
Glass's head of valuations Rupert Pontin said: "Smartphone and tablet technology is something that is already integral to the lives of younger car buyers in a way that is more rarely the case for older people.
"Car manufacturers know this and most are now working on a new wave of connectivity systems that will see your smartphone functions become a part of the dashboard display and functionality. Essentially, these integrated systems will augment and replace the same functions in today's cars.
"Several have chosen a partner for working in this arena and, predictably, have chosen to go with either Apple's CarPlay or Google's Android Auto. However, these two are unlikely to be cross compatible and here is where the problem lies.
"If you are a car manufacturer that has chosen to go with Android, can you still sell your car to a committed Apple smartphone user? This is something that might make older car buyers roll their eyes but for many people in their late teens and early 20s, it is a genuine issue. Backing the wrong horse could see their models become not just less attractive to a growing group of buyers but also see their residual values hit.
"Unless compromises are made over the operating systems being installed in vehicles to encourage something approaching universal compatibility, some manufacturers and owners will inevitably lose out."