I won't be using one of these in my Bentley.
Q. How do I service the Frantz Refiner? A. Place a roll of toilet paper centered onto the filter base tucking in any paper overlapping the edge. Cover the toilet paper with the canister and clamp it in place making sure the knob is tight. That's it. The toilet paper should be inexpensive quality with a 4-1/4" long cardboard center core. The core should not be tight with the center of part of the canister so oil is allowed to travel through the cardboard core for circulation.
There's no mention of which grade of Snake Oil is recommended.