I am rapidly approaching my first oil change on an '06 Dodge/Cummins 610 and in the course of deciding on an oil/filter stumbled upon this site.Great site lots of information , thanks. This leads to my question. When is it beneficial to begin oil analysis? Now(5k)? 10k ,50k or more. It seems reasonable that starting early would provide good baseline numbers but maybe early in an engines life numbers are skewed due to wear in. I traded an '01 Dodge/Cummins with 140k using Rotella T for its life with an OCI of 4k. I never had this oil analyzed but always felt that 4k was about the reasonable limit. I would like to extend the OCI on this engine to 5k or 7.5k and plan to use either Delo400 or Tection Extra in this engine with Fleetgaurd Stratopore filter. I would appreciate your opinions on this matter.