My 2016 ghibli s just got approved for warranty work. They’re replacing the entire steering system under warranty. I’m also getting some other service work done including All my fluids including break fluid, pollen filter and air filters, serpentine belt and the spark plugs. The quote I got for everything not covered under warranty is around 1700. Is a spark plug replacement worth 600$? I’m deciding wether I should do it myself or not.