Old hobart s-30 mixer oil
man you got an oldie but goodie mixer!im a hobart service tech for 8 years and have only seen about two dozen,unfortuantly parts for these units are exhuasted.as for the sight glass they do become cloudy over time and you cant determine the oil level.use a heavy gear case oil.the only way of telling is to drain the oil or if the unit is loud you should probably cange the oil.
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