Can anyone help my by recommending a light oil for small precision mechanisms? I have been playing about with low differential temperature sterling cycle engines recently, and have one that quite happily runs on the tiny bit of heat generated by my computer monitor. Obviously a minuscule amount of power is available for these things, and good lubrication is vital. WD40 works fine for a few days, but then turns sticky and has to be cleaned off. 3-in-1 is too thick, and the "Clock Oil" I bought from Proops last year is OK at first, but again turns sticky in a week or two. Any suggestions welcomed.
Mike D Pembrokeshire