As I tried to say in my original post, I've always been a little leery of adding gas treatment to oils. Just always seemed like the old-style easy-way-out that most likely wouldn't work. The only possible benefit I was wondering about in my situation is the fact that my turbo is cooled by the oil, so anything that reduced the chance of an oil "cooking" in a hot turbo after shutdown could be a benefit to long-term turbo survival.
Synthetic oil is used in Jet engines. Does that answer your question?