SirKeats, RP Synchromax is not really a direct replacement for GM or Chrysler synchromesh fluids. It is too thin: 7.7cSt versus the 9.0-9.5 cSt you should be looking for (both @ 100 degrees).
OK, this is a site for hypermilers, people willing to go to extremes. A thin oil would offer less hydrodynamic drag, right? And that can save a few percent in fuel economy? True, but you can damage the tranny too, depending on the conditions, driving styles, climate, etc ...
So, is that extra 2-3% more mileage worth the chance of a transmission replacement in a year or two? Each has to make his/her mind up on that one.
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--- Bror Jace
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