Al Case may be silicone. I really don't know, but by strict definition, silicone is not a petroleum distillate. It's a man-made material. That doesn't mean AL Case doesn't contain both, but I don't know if the two would work well together. You're not suppose to mix petroleum oils with silicone oils as far as I know. An email to Al Case might be brewing. Amasing how confusing a seemly simple topic can be. Anyway, I use Blue juice. God only knows what's in that stuff.