Howdy, so when I drive fast (70 mph), my engine will spit out about a gallon or so of oil with no warning. I'll just arrive at my destination missing a gallon of oil. (I check it every time I drive it) The strange bit is that it doesn't lose even a drop during normal driving (45-55 mph), regardless of whether it's on the highway or around town. It also doesn't leave a drop on the ground when parked. However, when it does decide to dump it's oil, the drip pattern runs all the way to the back of the truck when parked. Does anyone have any ideas as to why it's doing this?

 

Sounds like it's related to either boost, or rpm. With this truck I'm more inclined to say boost. Could use some more info on the truck to figure it out: mileage on the motor, mods, etc.