Just had mine serviced at Chester Transmissions and I asked about the LG8 fluid. They said not to bother and if it was working OK before (which it was) then leave it as is. They put the LG6 fluid back in and I have had no issues and it was about £250 or so.
I raised my concerns about auto transmissions being very susceptible to failure after an oil change and the guy said that changing oil would not cause issues that weren't underlying before or waiting to happen anyway.
Sorry to hear of your woes and hopefully whatever it is sorts itself out or Mackie's can fix it. Would be interested to hear what they say it is as sometimes my car does that 1st to 2nd and 2nd to 1st gear hesitation/snatch thing (mainly on downhill downshifts). But it always has done since I had it at 15k miles. I thought it was a "feature" !!
