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If the trans has no issue, I would personally drain it completely (what ever comes out which is about 2/3s, not a flush), drop and clean the pan and debris magnet, replace the filter with OE. Then fill with a high quality aftermarket synthetic compatible ATF like Amsoil or Redline.

I know there is a lot of debate on the WS vs other ATF. I don't think there is anything special about WS. In fact I do not believe it to be a full syn fluid. I know that when I drained my WS the first time at 50k is was a little burnt. Fill with amsoil .My next drain and fill was at about 70K and fluid was in much better shape. I do drain and fills at 30-40K. Now my trans is at 170 and still shifts like it was new. I also have no issue mixing fluid brands. Have used MAxlife (though not preferred), and Redline (IMO the best).
 
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