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[Marks DTM Calib]

that thing which makes diesels shite on economy every so often, as to clean them, I believe the engines just dump fuel in to clean them.

Quite the contary, the ECU carries out a late injection which emans that the exhaust temperatures go up, this results in the DPF getting VERY hot and burning the particulates off.

Oh, I thought they resulted in very bad consumption during its clean cycle?   

Nope, if it's an auto they usually drive as if they're in Sport mode to help burn the soot off. Doesn't ruin the fuel consumption at all 

Are they all like that, cause what I'm going on was from this thread ages ago, about Volvo DPF affecting fuel consumption:

http://www.omegaowners.com/forum/YaBB.pl?num=1303150950/5

They do affect consumption during regen. 

The Volvo also has another little issue where during regen the oil gets a load of fuel in it.....this has (and I have seen two do it so not that rare) on occasion resulted in the engine running on its own oil right up to the moment where the conrods throw in the towel!

[Del Boy]

that thing which makes diesels shite on economy every so often, as to clean them, I believe the engines just dump fuel in to clean them.

Quite the contary, the ECU carries out a late injection which emans that the exhaust temperatures go up, this results in the DPF getting VERY hot and burning the particulates off.

Oh, I thought they resulted in very bad consumption during its clean cycle?   

Nope, if it's an auto they usually drive as if they're in Sport mode to help burn the soot off. Doesn't ruin the fuel consumption at all 

It bloody does!

Yes they drive with more 'go' but the late injection i not ideal (hence the heat) so efficiency drops off

I'll stand by the fact that my 2 tonne car with a 3.0 diesel still gets 33 MPG when it's doing a DPF clear out, to me that's not ruining consumption.

[Marks DTM Calib]

But will be les than standard by many tens of percent....hence during the regen consumption is in comparison, shite.