Drinking too much
beer in Munich ;)
Join Date: Feb 2012
Location: I would rather not say
Oil degradation is a misnomer used by both AlfaOBD and MES. It should read 'oil quality'
When you reset the oik service counter oil degradation is set to 100%, and it counts down as oil qiality reduces. No measurement of oik quality is actually made...the quality is calculated, from the mileage.
Diesels don't use sensors to mointor oil quality because the oil can become contaminated with soot, but the viscosity may now be badly affected due to to soot.