I undestand this is a problem here also, some say its becouse trailertow,some say its to mutch tork on low rpm (diesel) I personaly belive in changing tran oil/filter becouse i dont buy the lifetime oil thing. Not everyone agres in that, but i change mine at 130000km and hope for no probl. Let oil varm up before floring it, let car stop before put in d or r.Do a search on this site and a lot of info/meanings on the trany subjekt. Dont read to mutch on this site and think all this problems hapend to you, enjoy you X!