I have had a problem every since first flying SR 7-1/2 with the Verner 3V. The Verner is a dry sump type of system and I mounted to oil tank on engine close up to crankcase to save weight. This was not the way to do it. After considerable study we believe the oil/air combing back out of engine did not have enough time and distance to separate resulting in pressure in oil tank and loss of oil pressure at times. The new tank is similar to one on ORV and seems to be working great. No blow out of overflow and oil pressure did not fluctuate.