Hi all. Looking for a little advice here please. I own a 2021 non z51 car. No intention of tracking it .strictly for cruising and trips. I have had the 2 free oil changes done already as I have Passed 10,000 km and I always change oil before I winter store . My question is about the transmission flush and filter change, I think I should do this now before another season of driving yet my dealership says it is not necessary yet. Reading online about some of the transmission problems owners have had I think this is a good preventative measure. What do you think? also is this covered by gm? Thanks