At what service interval, do they change spark plugs? on 2008 Land Rover LR3

I'm currently at 77,000 miles on my 2008 Land Rover LR. At what service interval do they change the spark plugs? Thank You

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2 answers
the factory says 105,000 miles. these are platinum tipped and can do that distance. if you take it to the
dealer, they will try to sell you on 60,000 miles or sooner.
almost all autos bulit now have platinum spark plugs which last 100,000 miles.