Our 2188 seems to leak oil out of the vent on top of the transmission when we park it. Is this a common problem with these combines? It seems to leak alot worse when the two speed is used. Were wondering if this has something to do with it. This fall we noticed it leaving a trail of oil going down the road if we used the two speed as well. The owners before us bypassed the switch so it will work in 3rd gear. So because of this we try not to use the two speed too much. Was wondering if anyone knew what causes this? New to the case side of things so we dont have too much knowlege about them. We'll probly find out later this spring when it goes in to get checked over by the dealer.