13-12-2016, 06:06 PM
Is it worth taking the risk of not changing it? All it takes is some enterprising copper to look at it, see the engine number doesn't match then decide that you've fitted a bigger engine without telling the insurance and seize the car. Also I'm pretty sure it's an offence not to and it's one of the ones that the DVLA and VOSA like to ra*e you for.