Originally Posted By: demarpaint
Mechtech2 is spot on. IMO TCW3 is a better lubricant, MMO is better at cleaning, either will work as a UCL. Mixing isn't going to harm anything.
I did notice a slight reduction in oil use with TCW3 or TCW3 and MMO mixed in my Aerostar vs just using MMO. That was short lived as I'm leaking oil from somewhere again, and its to cold to be looking for it.
+1. I share the same belief.
My oil consumption this OCI is also down 20% from its mostly steady (since I bought it May '10) history of 1 quart per 1.2k, on the diet of MMO & TCW3. TC-W3, in my case, had no effect on it in the past when I used it alone, in my own case, but the MMO seems like it somehow may be. But I like the TC-W3 in there too for that little extra lubrication it provides over MMO alone.
And either of them, together or separately, seem to provide a small mileage gain (1-2 mpg).
-Spyder