Saturday night I was driving home and all of a sudden my F-350 6.0 PSD would only go about 35 mph, and the speed odometer was reading 90 mph.
So I had to drive 35 mph all the way home. It didnt throw any sensors, all the gauges read right except for the speed odometer.
The nex day we checked the oil, and it showed empty on the stick, so we put oil in it and it ran better.
Then Monday took it to the shop and had them look at it. First they said it had a oil leak from some hose, then came back and sait it had 3 quarts too much oil.
They replaced the hose and drained the excess oil. It has been running good, for now anyway.
Has anyone had a similar problem?

Thanks