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Mack oil spec EO-E for RVI transmission



Question regarding my 1989 MS300 midliner with 6 speed RVI transmission.  The manual calls for Mack EO-E oil, I assume this is engine oil?  Any idea what grade would be appropriate?  I am thinking either a 10W-30 or 15W-40?  Please advise.

Kind regards

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I actually had a manual for the 5, 6 and 9 speed RVI  transmissions in my tool box . All it says is “ Gear Oil. MIL-L-2104D or MIL-L-2104C. SAE 40 weight “ 

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