I dumped a load of oil after unknowingly catching a cornstalk on the drain valve lever on the grain truck year before last. I got it on the road as usual and was up to about 35 mph when it lost oil pressure. I kicked it in neutral, shut it off and coasted it toward the farm. Momentum brought me to within a few feet of the driveway but to this day there is a 2 mile plus long black diesel oil stripe on the road. I stuck a big fat cable tie on it as a precaution and so far so good.