I am concerned about the condition of the Prius transmission fluids that have been analyzed, even though mine is not known to have suffered from this (my first fluid change at 70-ish K miles was not analyzed). If any of the small number of transmission failures were caused by fluid problems, we really need to start developing a precautionary fluid change schedule. This, of course, is exactly what Bob is working on.

When I got the 2001 Prius fluid changed to WS, I anticipated that it would simply be another periodic maintenance expense. Quite surprised to see the magnitude of fuel efficiency increase; such that fuel cost savings will be comparable to the cost of fluid changes henceforth.

Ha! An aspect of Prius ownership where the phrase "pays for itself" really seems appropriate.

DAS