MOT Diesel Emission Test

[kenn]

My C220D has just passed its MOT. The smoke acceleration opacity mean value is 2.74, max allowed is 3.0. I have been filling up with Shell Diesel Extra for the last 2 years. Do I still need to add diesel additive or is the CAT on its way out?

 

[Blobcat]

Possibly more to do with how you drive and where. If you spend your time around town they can soot up badly. Put some diesel injector cleaner in a full tank then give it an Italian Tune up (full throttle in as many gears as legally allowable). Look in the rearview mirror and you will think you have a 007 Q fitment smoke screen

 

[C220GJS]

Agree with Blobcat. When i ran a turbodiesel, the tester at the MOT station I regularly used advised me to phone half an hour before the test then take the car for a blast down the motorway and they would test it as soon as I arrived. Always passed the emissions test by miles.
Geo.

 

[kenn]

Thanks for the advice