Interesting what Saint Jack said. I had never seen any helicopter oil in NZ for at least 30 years other than Jet II. now there is the new 256 or what ever it is, and other people go and buy some other different oil, probably cheaper...
But there must be a reason why, right through the 80s and 90s most people, that were running JRs and 500s, all had Jet II. it certainly wasn't the cheapest, but all i got told was the other stuff was ****!