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I have a 5020 and I have been using 10w40 in mine for years now,, just make sure its diesel rated oil. Valve lash adjustment,, how many hours are on it? I can tell ya Ive never taken the valve cover off mine, its an 84 and has just over 1k hrs. Your starter issue could be a number of possibilities, best to put a meter on the solenoid and check voltages to determine the problem component.
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