Hello together. I got a 91 Sierra, just 105000 running, driven by a Ford workshop master, well-kept and technically in order. Was now the first time on the highway, I drove extra gently (up to 140 or 150km/h). On some mountain I wondered that the car was getting slower and slower, then a terrible rattle started, and just on the descent, a bit of the conrod beats me through the oil pan and jumps under the car. Oil was enough, the fuel was the right one. No great experience with my first Ford. Has someone an explanation Timo