one brand is over $50 GallON and another brand like half that price If I could see like I used to I would direct this to DAn In P eNN. the oil that goes in the FD pumps Dan how often do you need to change the oil nd how much does it take? it e seems cheaper to buy the Gallon size please advise cause itv sems to keep going up in price like about everyting,, thanks all and BLESSINGS