tylerstanley Posted April 9, 2009 Share Posted April 9, 2009 Im changing out the oil on the S440 rear end on my Mack. It has not been changed since it arrived from the factory...... Do they fill it with synthetic or the Dino stuff? If it was Dino, can I switch to synthetic without screwing up the seals? And I also have a Eaton 8LL that im going to change the oil in. And I dont know if it had synthetic or Dino oil in it from the factory. Do you reccomend any good oilk types in these pieces to keep it quiet and running smooth? Thanks. Its a 06' CV713 by the way. Quote Link to comment Share on other sites More sharing options...
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