I have a late model 240 diesel, and my question is this. At trips on the highway at above 65 mph for like a 400 mile round trip. It will suck the oil out. If you drive it around town it is like very little oil consumption. It doesn't have many miles on the car in my estimation. Like around 100K or a bit less. I know from articles that valve stem seals are not the culprit on this motor. As I did replace them to no avail. My wonderment is will valve guides help this motor or not? I wouldn't mind fixing the head with new quides etc. if that would eliminate it. I definitely do not want to do a total engine rebuild on this MB. Also, I am curious to find out if this motor did use oil or not when driven hard?? Any feedback would help, and any other suggestions. Sometimes I wonder if it might be something else causing the problem.