I got a 96 2500 with 560000 km on it and I'm having issues with oil coming out of the engine vent tube at 120+ Km/h if anyone knows of this or had problems with this and have found solutions ur help is greatly appreciated

 

Well how much oil is coming out? I know after a long hard drive I leave a orange sized spot under the truck, also I can see the side of the engine block it has a coating of oil on its side. I burn threw a quart every 2,000 miles. Hope that helps with your question

 

It is caused from blowby. That is why the oil gets into the tube and then on the ground. If you understand basic engine fundamentals you can figure out where to check. Somehow you are getting combustion pressures into the crankcase. Try a leak down test to see which cylinder is giving you issues

 

Also, dont rule out a possible injector(s) stuck open, dumping raw fuel into a cylinder(s) and washing passed the rings and mixing/ diluting the oil in the crankcase. This will cause the oil/fuel mixture to overfill the crankcase to which it will spill out of the vent tube. Check your oil level. If it is waaaay over the full mark, your likely "making oil" through the event decribed above. If its low, your likely losing it through excessive blow-by. Just tossing it out there..........

 

I have had that happen to me personally. This does not sound like the case

 

did u ever find out what it was mine only does it when i go above 120km/h at 2000 and up rpm if i run lower speed n rpm its fine. right now its still stock but I'm wiry on doing stuff to it and f**k it up more.

 

boost pressure goes up.
cylinder pressure goes up.
old rings combined with tapered cylinders results in a poor seal at high cylinder pressures.

Don't worry, I have the same thing. although my engine leaks from all orifices (even after a full reseal, I still coat the bottom on the truck), so it's difficult to tell.

I get minor (read: next to nothing) out of the blowby tube, and more from the dipstick tube actually. then again my dipstick collar is broken.

 

It is not that abnormal.
i meant i had an injector hang open... twice

 

I was more explaining why your truck does it (oil out the vent tube) at higher RPM (vehicle speed has little to do with it, beyond potential engine load)

 

That happened to me as well. 2 injectors hung open, as a matter of fact. My engine was puking diluted oil through the vent tube BIG TIME. Coated the entire undercarriage. At least now it wont rust under there....