I am using the oil extractor as we speak and is it me or is this thing extremely slow? It seems like molasses coming out of there. Also, I pumped it a few times and I am not sure if this PUSHES pressure into the engine or just pressurizes the system, or rather, creates a vacuum, w/o pushing pressure onto the seals ans so forth? Is that how it works? Can pumping a few extra times to try to get a flow cause any strain on the seals?