[lm6y]

It's not doing it any wonders. I would get it fixed. It sounds like the diaphragm in the modulator valve has a hole in it.

On the up side, you have stumbled upon an old used car salesmen's trick (one of the few that actually work). Trans fluid has all kinds of stuff, other than oil, in it. Friction modifiers, solvents to eliminate gumming up, and anti - foaming agents.

The friction modifiers will add just enough friction to let the rings get a "bite" and will usually re-seat themselves after a while. The solvents will burn off leaving the combustion chambers spotless (seen it in a few engines I've torn apart).

With 346K miles it might have done it some good. I'd still get it fixed though. It's probably doing wierd things in the transmission.