Check the oil level after the car has been parked for at least an hour ........... if you have to put any oil in, do so with the stick back in then start the engine to mix the new oil with the oil in the sump (when you put fresh oil in, it goes past the dipstick smearing it as it goes in, and this is what you are seeing with the patchy appearance) ................ leave the car for another hour and check again .......... the difference between the low and high mark is getting on for 1.5 litres
and finally .....................................
as Husky once said ...............
the DIPSTICK on a 350Z was designed by a DIPSTICK !!!