When I went to the MOT the mot man put the car on the emissions machine out of interest we got:
1.25 CO which is good but a hydrocarbon reading of over 2000!! car runs and drives fine, explains the unique smell the exhaust has.
A modern cars hydrocarbon readings pass level is 30 apparently.
Any thoughts as to why its so high, I think thin oil and unburnt fuel plugs do not fowl up so I am not too worried.