My VW dealership has always told me my 2014 Touareg had permanent fluid never to be changed. It had recently started hanging up in 3rd gear when accelerating slowly with a cold winter transmission. It would always shift but only when rpm's were elevated. I finally decided to get it changed in spite of VW. I was worried it would never move again. It came out fine but still hangs up a little in 3rd. I will have it done again perhaps as soon as 10K miles. VW does charge a lifetime price for their transmission fluid. $47.25/quart for 6 of them. I had it done for $392 at a local garage.