I realize this thread has wandered far from the HPL in a 3.5 EB topic, but since it already did…by the OP… let me express my concern with the Fumoto, Valvomax, Stanlbus products…specifically on an 3.5 EB….at least the Gen 1. Question: is the drain HOLE positioned and oriented such that it will drain most all the pan, because the HOLE’s lower edge is approximately level with the floor of the pan???. However, if you use a “permanent” insert, the effective bottom of the hole will be above the floor of the pan??? On my Subaru, the hole is slanted downward within a “downward bulge” in the base of the stamped steel pan…so for THAT vehicle the Fumoto, Valvomax, or Stahlbus won’t impede near-complete drainage. Worded another way, on the Ford, if the wall of the threaded insert is 1/8” thick, wouldn’t you be left with 1/8” layer of used oil left in the bottom of the pan, unless you tilt the vehicle to reduce the amount of oil held back by the reduced-diameter hole, which is now 1/8” above the floor of the pan. Or maybe I’m wrong and the floor of the pan is above the hole casting??? That’s possible. I guess one way to test that would be to stick a small screwdriver or equivalent into the opened drain hole to “feel” where the internal floor of the pan is relative to the hole.
****I edited this to pose my concerns more like questions instead of statements of fact, because I don’t know where the floor of the pan is relative to the hole…though it seems “flush.”