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antifreeze in oil

85 mack

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Just drained the engine oil on my Mack e6 350 motor. There was some antifreeze in it, not much. The  truck is a 1985 RS688LS . It has 105000 miles on it and 4600 hrs.  Any ideas on where it might be coming from and if so how hard is the fix?   

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Pull valve cover and check core plugs , prone to leak with age ,  they are the 1/2 square plugs under valve cover . If they are. The issue it will be visible , just drain coolant down some remove and clean install pipe thread compound and reinstall , or could be one of many other issues . Start with easy stuff first 

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