i know these cars are built like a tank, should u take it to the dealer every 30,000 miles, 20,000
10,000 miles and do u have to take it to them to get the oil change? basic service

You do not have to have your car maintained by the dealer. Places like Firestone, Goodyear and any independant shop in your area will charge you less and do the same job. Technicians at the dealership are not any better than the ones at an independant shop. I run an independant collision center. Every one of my employees has worked at a dealership. Just about every technician that works at a dealership has worked at an independant shop. Nothing special about the dealer except their prices.

owner manual wil say when or you coul dtype it into search box INFINITY Q45 maintenance

most car two years
most go by mileage or if one sees a differents in mileage or how its running car can need something done at any time and when its needs something you find with maintenance you have it check like once a year should be check when service and id never go to dealership for that
they in business to sale cars where shops are in business to repair them dealership should be last place and wil be highest place