On The Road Posted May 30, 2009 Share Posted May 30, 2009 In the Operation Manual for 1959, this is for a 1959 H-67 with a END-673, they recommend EO-E (Heaviest-duty Engine Oil) and list Military Specification MIL-L-2104B.As for the grade table 10W-30 looks like a good choice. But this is what they used in 1959.I am going to change oil, what oil should I use that is available today and where to get it? Same oil you all use in these old Macks.Thanks,Double Diamond Quote Link to comment Share on other sites More sharing options...
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