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Now it's getting embarrassing... at least for me! I had suspected that my CDR valve wasn't working correctly and that I might therefore have had increased oil consumption. After I had lost sight of the issue, I went back to it yesterday. I had ordered a new CDR valve with the car at the time. So...

But, can a broken CDR Valve be the cause of increased oil consumption?

The smoke from the exhaust is not something I find alarming. You only notice it if you drive directly behind it or consciously observe it in the mirror. A classic diesel. You can see when the driver accelerates. Of course I can't check whether my engine had the 2kml on it when I picked it up...

Is the CDR changed frequently? As part of the maintenance schedule?

Hello together My rig starts burning oel, i think. Not dramatic but noticeable. I think 1 quart on 1k mils. At the same time, I imagine that I am getting more black smoke from the exhaust when hitting the right pedal. But my air filter is still clean. No oel on it. My motor has only 10k miles...