This topic was brought up a couple days ago. See http://cs.trains.com/mrr/f/88/t/211550.aspx.
It should be noted that the product in question was used on the metal to metal connection between the Athearn truck bolster and the mating pin on the frame. I don’t believe that it was to be used as a general gear lube. Used in moderation at that point it would probably not cause a problem with any plastic parts.
I agree with the use of the Labelle products for everything else in the model, but I don’t think one would want to use the Labelle grease at the point in question because I believe it to be non-conductive.
That said, I believe the video link I posted in my post to the referenced previous thread sort of implied that the Aristo lube ate its own container. If that’s true, probably best to avoid the product. The last poster in the referenced thread recommended another conductive grease that one may wish to try.