In Cat shops the oil is filtered when dispensing from the bulk tanks . Per what Nige says. It’s part of contamination control standards for dealerships.
in fact Cat says you Have to filter all free pour oil such as oil of jugs and buckets. Obviously anyone who has worked with buckets and jugs of oil knows how awkward doing that would be but that’s what Cat says.
I joke that our next step is going to be filtering the waste oil
I have not filled the engine this way but I easily could. I have filled the Drive loops on hydrostatic machines this way. I have an adapter to unscrew the nozzle on a bulk oil and attach in its place then I can connect a hose from it to a test port and fill through that.
99% of the time I put an engine in it’s a rebuild from our rebuild shop and thus it’s been broken in and run on the dyno so no prelube necessary