in a perfect world yes. but what I believe is happening is this. oil gets in there, with moisture,ice etc. it has a very small vent hole in the cap.and the angle of the tank is on the boarded line of venting at idle anyway. if your sled is tipped to the left a little or the trailer isn't level then its not going to vent anyway. if the pump draws more then 10"water column of vacuum it will never vent until the cap is opened. I have already tested this. with a empty tank with a mity vac. I banged the tank off the work bench and shook it as hard as I could. did not open the vent. and the ball was rattling the whole time. granted this takes a lot of things in combination to cause this. but do you want to gamble with your $12,000 sled? it can happen under the right conditions. the other thing is its causing erratic oil consumption from no venting then venting then not again. if your out west pulling a long shoot at wot the cap is not venting. and its using the most oil at this throttle position. it wouldn't take long to draw a fatal vacuum. maybe all the sleds in the west going down was due to this and nothing else?