I just purchased a 03 Infiniti G35 6mt with 120k miles. It was a one owner vehicle who took very good care of the car and almost all maintenance was done at either Nissan or Infiniti with receipts. But not one showed a trans service and now has 120k miles and I would like to replace the fluid. I've heard the horror stories about changing fluids this late in game is not good and have killed trannys but I'm skeptical on that one. I was planning one using OEM ATF but can you experts enlighten me please.