Hi,
   ....so here goes, I will write what info I have:
Oliver Streamline Series Tractors
(Models 60,70,and early 88
  These tractors had a fairly straightforward paint scheme. They had green bodies,red wheels, yellow grill screens,and lettering(except the red-colored Model designation on the side panel covers), and red trim-including the vertical stripe on the grille and the frame accent stripe.
           [b:2idos3ei][i:2idos3ei]Paint codes:[/i:2idos3ei][/b:2idos3ei]
  Green:  Martin Senour 99L-8748
  Red:     Martin Senour 99L-3752
  Yellow:  Martin Senour 99L-11611 or Dupont Dulux 029

These paint codes are for a 70 as you say you have, but according to my data by 1948 they were making the 77 fleetline and the numbers are a little different. Are you sure you have the year correct? If you have the serial #, I can tell you the year. Let me know. In the meantime I will recheck my info to be sure i've got everything straight. 
             Hope this helps... or did I get you more confused <!-- s:roll: --><img src="{SMILIES_PATH}/icon_rolleyes.gif" alt=":roll:" title="Rolling Eyes" /><!-- s:roll: --> 
                           Cal