[toss1]

>>I think some of the dithiapentane might degrade into stuff that's more more reminiscent of petroleum products.

Seems very likely, considering the process of refining or"cracking" oil into usable products is based on temperature and pressure, and organic compounds in general have different reactivity at different temperatures. In cooking with oils, one of the key properties to consider is their "smoke temperature", above which they will not be cooking your food but smoking and ruining the flavor, so you must select an oil that is good at higher temps than you need to cook the other ingredients. So, it wouldn't be at all surprising if there's a threshold temperature that will break or re-combine the molecules of this artificial "truffle oil" in a way that ruins it.