I went around and around with this online, and I found one place where I could buy their exact kind, but it needed to be a gallon. A local dealer said to use Tri-Flow. I called Elbert at Juki and he said to use a good quality white oil like a Bernina oil or similar. He was very down on the Tri-Flow, so I didn't end up trying it. Not sure if others here are using it.
I'm not out of the sample oil, but thanks for the link.
Hugs,
Charlotte