Hi, whilst I do not have a drawing of the dipstick for the Sun Engine, I do have a dipstick, so here is a photo of the dipstick from my Sun Engine. I assume low oil is none on the dipstick and that as long as there is 1cm of the dipstick with oil on it, all is fine. In practice, when running on steam, the oil becomes emulsified (white and sticky). Hopefully there is enough information in the photo for a dipstick to be made.