Cummins ISX 475 with 980000 miles is using a lot of oil......

If it ain't leaking out, its burning it. You're looking at having to spend some $$$ either way.

 

Sure there is the odd unicorn out there but generally all the new garbage around here guys are rebuilding them very early.

Not good engines if you ask me. Some stuff is getting done under Warrenty and others are just off warranty. Not good.

This guy could just have broken rings or carbon packing on the rings . Real common on thise red engines.

 

Egr has nothing to do with oil consumption.

1.6 million km almost and you put new pump and rolled bearings in. ?

Did you change brands of oil when you did this. Sometimes engines with lots miles dont like this and they will burn oil after.

 

Everything you want to know about the ISX and how to rebuild the engine. This guy has add kinda of info about the ISX

 

This is what i think happened.

The oil they used could of or should i say probably had a higher detergent package then your delo. Now 40,000 km later loosened up the carbon around your rings and pistons causing it to start burning oil..

Not much you can do now , even switching back to your delo is a moot point as its not going to fix it self.

You either live with the oil consumption or rebuild it.