Our company work truck was traveling on a major highway going around 60-70 mph and high revved, then shut off. Our driver was able to coast to the shoulder of the road. When he got out, he saw that the truck had dumped a large amount of liquid. Come to find out this was oil from the oil cooling lines, and our engine has now locked up. We took it to the local Chevy/GMC dealer, where they quoted up 17K to fix the truck.