For 7 years I and 7,000 miles, I ran CSX 3183 with a road draft tube from the rear of the intake and the intake
oil fill tube with a
oil cap on it. Never had any
oil residue on the intake, or any oil, gunk, goo or mist from the tube.
Run the Pentroofs, without holes, get the "RIGHT LOOK" period correct, and never worry, if it worked originally , and worked for me, it will work for you.