Hi Zedster and welcome.
1) The Z has a 3.5 v6 piston engine under the bonnet.
2) No cambelt, its chaindriven.
3) Oil hardly needs topping up at all, some rev up engines had an issue with excessive oil consumption but that is very rare, semi synthetic is ok, but most owners use fully synthetic.
4) Ordinary water and coolant mix.
5) 250 to 350 miles to a tank depending on the weight of your right foot
6) Bose cd player skipping, clicky rear axle, also the paint is rather thin, so stone chips wont be uncommon. Maybe a few other issues but generally a great car all round.