BigAl,quote:
Well, Andy, I personally have had a perfectly functioning Mopar transmission start shuddering immediately after a Dexron based fluid change . . . and fail two weeks later. At the time, I didn't know shops actually did this sort of thing or I would have gone back and demanded the offending shop to fix it. I have seen friction and viscosity curves of Mopar fluid vs Lubegard added concoctions, and they are quite different . . . as is their ability to withstand the heat in Mopar transmissions. The high failure rate in Hyundai transmissions is largely from the same practice.
Not to say I don't believe you but it sounds like the tranny shop didn't put the lubeguard in. I have literally done hundreds of these including to people I personally know and see on a regular basis and not once have I had a problem with it or had a comeback related to poor transmission performance or shuddering. I can think of one customer right now in fact that has over 300K on an early 90's caravan with the original transmission who has gotten a lubeguard trans service every 15-30K miles, which what the severe service recommendation is on it. No problems at all.
Is it 100% as good as using the OEM fluid? Not sure. Is synthetic better than dino? Depends on what you are comparing and what your needs are.
Andy