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I was wondering if there is anyone out there that has used Amsoil or Castrol Transmax or any other brands
that swapped out the Ford Fluid for aftermarket and what their experience has been.


I want to switch my mercon lv trans fluid out of my 2008 Ford Focus and put in Amsoil's Signature Series Fuel Efficient synthetic transmission fluid (blue cap ) .

Not finding much info on the internet of people who have tried it.
 

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2013 Focus SE gray 5 spd hatch
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The 4F27E trans always used LV fluid. As long as another brand meets that particular specification then they are suitable. If they don't meet that spec then simply don't use it. It will say on the container or the website details if other brand fluids meet certain specifications. Different trans fluids have different properties and levels of refinement to them so it's important to use what is specified or you risk trans failure.
Here is the official Ford chart: automatic transmission fluids chart_english.pdf (motorcraft.com)
 
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