Borrowing a N.I relatives car to drive in Rep. of Ireland

I am resident in Rep. of Ireland and need to borrow a relative's car for a period of time. The car is N.I reg and owned by an N.I. citizen. I'm already named driver on car. Does anyone know if there is any problem with this?

The garda might have something to say if this is an 'extended' period of time. Say, if the car resides at your property rather than the property it is taxed and insured at for any length of time.... they might decide that you are trying to evade VRT and confiscate it. I'm not saying that this is the case in your hypothetical situation, obviously, just that I know others have tried it on in that way....