'Petroleum' is the raw goo that they pump out of the earth. So not, its not that.
Its just an additive package heavy on esters and modifiers.
Also, what IS unstable oil? What test can I run to find out if my oil is stable or unstable? A match? The plastic gear thing at the FLAPS?
Set out a bottle of Lucas snake oil in winter.... they tell me you want that tar in your motor at a 0F startup.
No thanks.
