I spoke to a local compass repair
shop. As they do not usually sell that stuff but use it for repairs
, they directed me to a local art store which is selling Stevenson odorless mineral spirit which is paraffin based and Ritchie are recommending to use it as an alternative to Isopar L which they sell. They have used the same stuff in their compasses
from 1950 to 2000. I got a gallon for $30.