Oh I think you are dead on, as I have never heard of that either (which begs the Q, where did I come up with it!) but I have never done PC types & I want it trouble free. EDIT I am most worried that the stem to seal fit may be too tight as I dont know the app/dimentions for these seals as I dont want to starve the stem for oil but if there is enough splash in that area??? it might be a non issue but the similar seal description in the Goodsen catalogue made mention of metering an amt of oil.