Bruce and list.I Learned a long time ago NOT to mix fluids.1956 at Bonneville we dicervered that Shell X100 and Bardal formed hydro-cloric acid and would dissolve pistons.There were lots of wasted engines that year.A Mix of AFT 3 and AFT 4 Might cause a problem.Oils mix but there additives some times do not.I don't even mix brands.Might point out that the vendors would give you a case of there product if you put there sticker on your car.That's how the bardal got in there.Jim McMullan 300 F [Non-text portions of this message have been removed] ------------------------ Yahoo! Groups Sponsor --------------------~--> Something is new at Yahoo! Groups. Check out the enhanced email design. http://us.click.yahoo.com/SISQkA/gOaOAA/yQLSAA/8LmulB/TM --------------------------------------------------------------------~-> To send a message to this group, send an email to: Chrysler300@xxxxxxxxxxxxxxx For list server instructions, go to http://www.chrysler300club.com/yahoolist/inst.htm For archives go to http://www.forwardlook.net/300-archive/ Yahoo! Groups Links <*> To visit your group on the web, go to: http://groups.yahoo.com/group/Chrysler300/ <*> To unsubscribe from this group, send an email to: Chrysler300-unsubscribe@xxxxxxxxxxxxxxx <*> Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/