Definitely the spark plugs. aluminum heads and long life spark plugs means stuck plugs. It is common for most cars these days to have plugs so frozen that they break off into the head when trying to remove them. This is partly due to newer style spark plugs being skinnier. The problem comes with a skinny spark plug is that the voltage is still high and the insulator still needs to be large and that doesn't leave much room for the threaded part. Better have this done at the dealer. Your CV axle boots will start to leak about this time. The boots don't get replaced any more. Instead, the entire axle is replaced for a leaking boot. Other than that, inspect or change brakes, fluids, belts, filters, trans oil, and inspect for any leaks. Make sure you have any recalls taken care of. Your dealer should be able to perform an inspection for you.

Good luck and STEEM On