Where should I sample the oil from?

Most industrial equipment will have a dedicated sampling point. These often require "bleeding" an oil volume prior to sampling as "deadlegs" may give unrealistic samples. If there is no sampling point then the midpoint of the dipstick (between the high and low mark) but if no dipstick is fitted then ideally no deeper than the oil pump pick up. A length of tube passed down through the dipstick hole or similar usually works well, with a plastic bottle or a pump connected to draw up the oil. We require 100ml of fluid. Suitable sampling equipment can be supplied on request.