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Turpenoid is odorless mineral spirits, as is Gamsol, and a number of other items marketed especially to "arteestes" under clever names. The implication is there is something "sensitive" and wonderful (or ecologically sound) about materials made "just especially for us, the select few." It all comes out of the same tank-car. Know thy materials!
Re/ solvents . . . a number of petroleum distillates, including kerosene, mineral spirits, xylene, benzine and "white" gasoline are all capable of attacking the structure of drying oils and some resins. Some are more active than others, some are more volatile. These are properties that may or may not be conducive to one's ends in the studio.
Given that most of the oil paint one buys these days is mulled in safflower oil, (which requires a siccative to dry within our lifetime)and produces a polymer film infinitely weaker than does raw linseed oil, I would recommend adding at least 20% by volume of good, raw linseed oil to any solvent used to "thin" oil paint.
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