Service Policy

Delphi strongly recommends that nozzles are replaced as a complete set every 50,000km. Whilst beyond 110,000 km the whole injector unit should be replaced.

Found at

http://www.delphidieselsystems.com/uk/UKDDSproductitems4137.asp

And, a good explanation of Common Rail injection operation:

http://www.dieselset.com/meng/motor_main.asp?id=6

I could be wrong but it did not look like that article applied to the duramax. These are delphi parts listed, not bosch parts.

Bosch for the Duramax.

It doesn’t apply Bosch makes Duramax