Of course you must change the transmission fluid. There is no such thing as a life time fluid on a vehicle. If you want to prevent very costly repairs, then change it every 60k miles at the minimum. Manufactures say this crap to save themselves time and money, and to cost you more money once the transmission lets go at the end of the warranty period.
Spark plugs really depend, most will say around 60k miles as well, and the front 3 plugs are easy to change, the rear 3 can be a huge pain in the butt.
Spark plugs really depend, most will say around 60k miles as well, and the front 3 plugs are easy to change, the rear 3 can be a huge pain in the butt.