Welcome, I've owned a Z for 12 years (2 cars) never payed any attention to the service thingy in the dash, I do Redline engine oil every 6k or once per year, Redline all other fluids every 12k or 3 years. Nowadays it's the yearly change for me since I work at home now. I drive hard and never had any performance or reliability issues over 170k miles, not a drop of oil burned.
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