skymast

I'm in the process of purchasing a '14 G550 with about 70K miles I asked them to replace the Spark Plugs, Diff Oil, and Transmission fluid as part of the purchase. While doing this, I received a call indicating they needed to replace the Fuel Rail Regulator, 16 Injectors, and I think the fuel pump. Obviously good that they are doing this but I'm wondering if this is 'normal' or a sign of other issues. Thank you.