Wow, guess the oil companies we (when I worked for an oilfield supply and repair corp) used to sell PTFE tape and paste (virgin pure, not the stuff they sell in stores) must have been pissed when they found out they should't be using it...funny, their engineers never said a word *G*
Personally, I've been working in the industry and using the exact same products in my business for a good 15 years or so with no problems..
Let me do some digging on this one...since PTFE is chemically inert, I find it hard to believe it's contra-indicated for hydrocarbons, especially since we sold PTFE encapsulated Viton o-rings for critical oil refinery process pumps (the only things that would take both the temps and stuff they sent through the pumps)...damned expensive little buggers, they were..
Hey, learn something every day..*G*