Replace oil & filters @ M4 (15/09/2011) - re sample wear check & send for analysis. from G.M.J. 2 x  Hyd. Oil Filter Element<Filtrec> P/# D131G03A.    $ 70.88.  1 x  Element Cartridge <Parker>       P/# TXX3D-10-B   $ 218.00 each. 1 x Water Separator  <Stauff>          P/# SF-6721-W.    $  139.00.