Future potential [used]Greenline owner

 Will the DPF light show when it is regening, or does it regen with no visible warning. Handbook seems a bit vague and I know on ours that the exhaust note can get a bit deeper with no visual indications - possible regen, but SWMBO says that the light is showning on the dash. 

The DPF will usually regen with no visible warning, it is only when it is really clogged and needs a forced regen that the light comes one. Some people report a slight increase in rpm when idle or a short spike in running mpg when it is doing a regen, but in 10000k of driving my used GreenLine I have never noticed that nor had the light come on, and I tend to drive very economically at very low revs, which should make the DPG clog every now an then.