Wrench light
 

Just got my truck out of shop at dealership, drove about ten miles and now my wrench light is on. They replaced egr cooler and front cover of the motor, flushed motor , the oil side and coolant side.
They said the loss of water caused the pump to cavitate and eat a hole in the front cover allowing water to mix with oil. Does that sound right?
Now the wrench light is on.

Yes that is how it happens. Have to stay on top of your fluid levels.

Wrench light is means there is another problem somewhere.

Maybe thermostats now.

i had noticed my truck blowing some white smoke out and starting to run rough when i accelerated, that is when i checked it out. started adding 4 gallons of water a day (3-days) untill it went into the shop.

Cavitation could have been caused by a few things. Primarily from low coolant levels allowing air to get inside the motor.

How long were you driving your truck after it started losing that much coolant?

This is a very BAD thing for these engines. A hole in the front cover will allow your coolant to drain into the oil sump, which can cause rapidly increased wear for the engine internals.

We've seen lots of rocker arm lubrication failures after 100,000 miles, and some attribute it to fuel or coolant in the oil. This needs to get taken care of ASAP! Also, I suggest asking your dealer how much antifreeze made it into your oil.

only drove it about 250 miles having to add the water. went back to dealership for wrench light. they said it had a restriction at the egr cooler sensor, now have to replace the egr cooler.