Not a classic truck by any means but a truck question regardless. my 2014 Chevy Silverado has 156000 kilometers (97,000 mi) on it. I've done all the regular oil changes, tire rotation (new tires actually), air filters, etc etc. But I know that the 150 mark is usually when you start looking into bigger maintenance. I think I need to do my spark plugs soon? What should I be doing around this point?