spark plugs every 100k new wires if needed, better fuel mileage and prevents code from tripping if it misfires.
I flush all fluids every 150k especially tranny and transfer case lucas treatments are my choice if used.
up here in the north where salt on the roads in winter will destroy a car faster than driving one to death the main thing is undercoating and washing. I have seen to many cars that have rotten frames from salt damage and can't be fixed. My gmc had both sides of the frame rot out in 5 years. two plates welded on only lasted 2 more years.