i've been using sewers aid on my threads (domestic and long arm machines) for 6 or 7 years now- it is totally safe for your machine- cuts down dramatically on lint build up- and really makes a difference with breakage problems- my sewing room would be neglected without having a couple bottles close at hand.
it was first recommended to me at a lqs- teaching machine quilting classes- they really sold us on it- and i've kept it in supply every since- it really helps with cotton threads that tend to break easily quilting-
but i use it on any thread that tangling may be a problem. or lint- or what ever