G12++

[Rob Burns]

G12++ is for lifetime of the car as long as it is topped up with distilled water.

Edit: Generally it gets changed when the timing belt as done as it's a very good idea to change the water pump at the same time as the timing belt.

[Transporter]

It maybe a lifetime fill, but I would change it in the 4th year and then every 2-3years. If you top up with the distilled water only, then the concentration would be lower and it won't be a lifetime fill at all. In that case you should tell your mechanic to check/adjust the concentration.