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I have a 350 but I'm pretty sure the stock 250 AWD 17s are 225/45 front and back and can be rotated. There is a package with the 18s not sure if they are staggered.
When i did my 5000 service, they told me tire rotation is not included for 2WD IS250 5000 miles free service. I have to pay $50 for each tire since the rear tires are wider and all tires have direction.
most tire places will do the rotation for free. 18's are staggered so no point in rotating them. even if you were to do the rotation i wouldnt let the dealer do it, theyd probably charge and arm and a leg.